{"id":2463,"date":"2020-10-18T11:23:21","date_gmt":"2020-10-18T03:23:21","guid":{"rendered":"https:\/\/www.study-together.com\/edu\/?page_id=2463"},"modified":"2020-11-02T17:24:44","modified_gmt":"2020-11-02T09:24:44","slug":"trigonometry-function-definition","status":"publish","type":"page","link":"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/trigonometry-function-definition\/","title":{"rendered":"13. \u4e09\u89d2\u6bd4 > \u4e09\u89d2\u51fd\u6578\u7684\u5b9a\u7fa9"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2463\" class=\"elementor elementor-2463\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6608973 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6608973\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-8317597\" data-id=\"8317597\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7a8b57c elementor-widget elementor-widget-text-editor\" data-id=\"7a8b57c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>13.1. \u00a0 \u4e09\u89d2\u51fd\u6578\u7684\u5b9a\u7fa9<\/h2><p>\u4e09\u89d2\u6bd4\u51fd\u6578\u7684\u5b9a\u7fa9 \u4fc2\u7531\u76f4\u89d2\u4e09\u89d2\u5f62\u5ea6\u767c\u5c55\u51fa\u569f\u5605\u3002\u8981\u5b78\u597d \u4e09\u89d2\u6bd4\u51fd\u6578 \uff0c\u6700\u57fa\u672c\u689d\u4ef6\u4fc2\u8981\u80fd\u5920\u6e05\u695a\u5481\u8b1b\u51fa\u4e00\u500b\u76f4\u89d2\u4e09\u89d2\u5f62\u5165\u9762\u5605\u8cc7\u6599\u3002<\/p><p><img decoding=\"async\" class=\"alignright\" src=\"https:\/\/www.study-together.com\/edu\/wp-content\/uploads\/2020\/07\/f1maths_trigo01.jpg\" alt=\"\u4e09\u89d2\u6bd4\u4e2d\u7684\u908a\u53ca\u89d2\" width=\"200\" height=\"137\" \/>\u55ba\u53f3\u5716\u4e2d\u7684\u76f4\u89d2\u4e09\u89d2\u5f62\u5165\u9762\uff0c<\/p><ul><li>\u6709\u4e09\u689d\u908a\uff0c\u908a\u9577\u5206\u5225\u70ba a, b, c<\/li><li>\u53e6\u4e09\u96bb\u89d2\u7576\u4e2d\u6709\u4e00\u96bb\u4fc2\u76f4\u89d2<\/li><li>\u201c\u659c\u908a\u201d\u6c38\u9060\u4fc2\u76f4\u89d2\u5c0d\u9762\u5605\u908a<\/li><li>\u53e6\u5916\u5169\u689d\u908a\u53ef\u4ee5\u53eb\u4f5c\u201c\u9130\u908a\u201d\u53ca\u201c\u5c0d\u908a\u201d\u3002\u4f46\u908a\u689d\u4fc2\u201c\u5c0d\u908a\u201d\u5c31\u8981\u7747\u4f60\u651e\u4f4f\u908a\u96bb\u89d2\u569f\u8b1b\u3002<ul><li>\u5c0d \\(\\theta\\) \u569f\u8b1b<ul><li>a \u4fc2\u201c\u9130\u908a\u201d (\u5373 \\(\\theta\\) \u65c1\u908a\u5605\u908a)<\/li><li>b \u4fc2\u201c\u5c0d\u908a\u201d (\u5373 \\(\\theta\\) \u5c0d\u9762\u5605\u908a)<\/li><\/ul><\/li><li>\u5c0d \\(\\beta\\) \u569f\u8b1b<ul><li>b \u4fc2\u201c\u9130\u908a\u201d (\u5373 \\(\\beta\\) \u65c1\u908a\u5605\u908a)<\/li><li>a \u4fc2\u201c\u5c0d\u908a\u201d (\u5373 \\(\\beta\\) \u5c0d\u9762\u5605\u908a)<\/li><\/ul><\/li><\/ul><\/li><\/ul><p>\u4e09\u500b\u57fa\u672c\u5605\u4e09\u89d2\u6bd4\u51fd\u6578 (sin, cos, tan) \u5605\u5b9a\u7fa9\u4fc2:<\/p><ul><li>\\(\\sin \\theta = \\dfrac{\u5c0d\u908a}{\u659c\u908a} \\)<\/li><li>\\(\\cos \\theta = \\dfrac{\u9130\u908a}{\u659c\u908a} \\)<\/li><li>\\(\\tan \\theta = \\dfrac{\u5c0d\u908a}{\u9130\u908a} \\)<\/li><\/ul><p>\u597d\u591a\u6559\u79d1\u66f8\u6703\u5beb \\(sin \\theta = \\dfrac{a}{c} \uff0ccos \\theta = \\dfrac{b}{c} \uff0ctan \\theta = \\dfrac{a}{b} \\)\u3002\u4f46\u5927\u5bb6\u4e00\u5b9a\u8981\u7559\u610f\u7576\u4e2d\u5605 a\u3001b\u3001c \u4e00\u5b9a\u4fc2 \\(\\theta\\) \u5605\u5c0d\u908a\u3001\u5c0d\u908a\u53ca\u659c\u908a\u3002 \u6240\u4ee5\u5927\u5bb6\u90fd\u4fc2\u8a18 \\(\\sin \\theta = \\dfrac{\u5c0d\u908a}{\u659c\u908a} \\) \u7b49\u5605\u516c\u5f0f\u5427\u3002<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-inner-section elementor-element elementor-element-17daa60 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"17daa60\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-c4462b2\" data-id=\"c4462b2\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7ba5f90 elementor-widget elementor-widget-text-editor\" data-id=\"7ba5f90\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/geometry-n-sides-polygon\/\"><i class=\"far fa-arrow-alt-circle-left\" aria-hidden=\"true\"><\/i> \u8207\u591a\u908a\u5f62\u6709\u95dc\u7684\u5b9a\u7406<\/a>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-0b14644\" data-id=\"0b14644\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-inner-column elementor-element elementor-element-9e0037b\" data-id=\"9e0037b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ed373d3 elementor-widget elementor-widget-text-editor\" data-id=\"ed373d3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: right;\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/trigonometry-basic-usage\/\">\u4e09\u89d2\u51fd\u6578\u57fa\u672c\u904b\u7528 <i class=\"far fa-arrow-alt-circle-right\" aria-hidden=\"true\"><\/i><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-3ea8180\" data-id=\"3ea8180\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5cc3d80 elementor-widget elementor-widget-sidebar\" data-id=\"5cc3d80\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"sidebar.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"sidebar-box widget-oceanwp-custom-menu custom-menu-widget clr\"><style type=\"text\/css\">.ocean_custom_menu-5 > ul > li > a, .custom-menu-widget .ocean_custom_menu-5 .dropdown-menu .sub-menu li a.menu-link{font-size:16px;line-height:17px;}.custom-menu-widget .ocean_custom_menu-5.oceanwp-custom-menu > ul.click-menu .open-this{font-size:16px;}<\/style><h4 class=\"widget-title\">DSE\u6578\u5b78 &#8211; \u5fc5\u4fee\u90e8\u5206\u3010\u76ee\u9304\u3011<\/h4><div class=\"oceanwp-custom-menu clr ocean_custom_menu-5 left dropdown-hover\"><ul id=\"menu-dsemaths_core\" class=\"dropdown-menu sf-menu\"><li  id=\"menu-item-1744\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-1744\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/course-analysis\/\" class=\"menu-link\">\u8ab2\u7a0b\u5206\u6790 (Core)<\/a><\/li>\n<li  id=\"menu-item-1745\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children dropdown menu-item-1745\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/\" class=\"menu-link\">\u5514\u597d\u4ee5\u70ba\u5514\u99db\u8003 &#8211; \u76ee\u9304 <span class=\"nav-arrow fa fa-angle-down\"><\/span><\/a>\n<ul class=\"sub-menu\">\n\t<li  id=\"menu-item-4067\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4067\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/solving-equation\/\" class=\"menu-link\">1. \u89e3\u65b9\u7a0b<\/a><\/li>\n\t<li  id=\"menu-item-4068\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4068\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/polynomials\/\" class=\"menu-link\">2. \u591a\u9805\u5f0f<\/a><\/li>\n\t<li  id=\"menu-item-4069\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4069\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/laws-of-indices\/\" class=\"menu-link\">3. \u6307\u6578\u5b9a\u5f8b<\/a><\/li>\n\t<li  id=\"menu-item-4070\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4070\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/factorization\/\" class=\"menu-link\">4. \u56e0\u5f0f\u5206\u89e3<\/a><\/li>\n\t<li  id=\"menu-item-4071\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4071\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/formulae\/\" class=\"menu-link\">5. \u516c\u5f0f<\/a><\/li>\n\t<li  id=\"menu-item-4072\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4072\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/percentage\/\" class=\"menu-link\">6. \u767e\u5206\u6cd5<\/a><\/li>\n\t<li  id=\"menu-item-4073\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4073\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/rate-and-ratio\/\" class=\"menu-link\">7. \u7387\u53ca\u6bd4<\/a><\/li>\n\t<li  id=\"menu-item-4074\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4074\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/functions\/\" class=\"menu-link\">8. \u51fd\u6578<\/a><\/li>\n\t<li  id=\"menu-item-4075\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4075\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/estimation\/\" class=\"menu-link\">9. \u4f30\u7b97<\/a><\/li>\n\t<li  id=\"menu-item-4076\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4076\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/inequalities\/\" class=\"menu-link\">10. \u4e0d\u7b49\u5f0f<\/a><\/li>\n\t<li  id=\"menu-item-4077\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4077\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/coordinates\/\" class=\"menu-link\">11. \u5750\u6a19<\/a><\/li>\n\t<li  id=\"menu-item-4079\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4079\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/geometry\/\" class=\"menu-link\">12. \u6f14\u7e79\u63a8\u7406\u5e7e\u4f55<\/a><\/li>\n\t<li  id=\"menu-item-4080\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4080\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/trigonometry\/\" class=\"menu-link\">13. \u4e09\u89d2\u6bd4<\/a><\/li>\n\t<li  id=\"menu-item-4081\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4081\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/shapes\/\" class=\"menu-link\">14. \u5e73\u9762\u53ca\u7acb\u9ad4\u5716\u5f62<\/a><\/li>\n\t<li  id=\"menu-item-4082\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4082\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/15-probability\/\" class=\"menu-link\">15. \u6982\u7387<\/a><\/li>\n\t<li  id=\"menu-item-4083\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-4083\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/junior_summary\/16-statistics\/\" class=\"menu-link\">16. \u7d71\u8a08<\/a><\/li>\n<\/ul>\n<\/li>\n<li  id=\"menu-item-3231\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3231\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/fundamental_algebra\/\" class=\"menu-link\">\u57fa\u790e &#8211; \u6578\u8207\u4ee3\u6578<\/a><\/li>\n<li  id=\"menu-item-3241\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3241\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/fundamental-shape_n_space\/\" class=\"menu-link\">\u57fa\u790e &#8211; \u5ea6\u91cf\u3001\u5716\u5f62\u8207\u7a7a\u9593<\/a><\/li>\n<li  id=\"menu-item-3246\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3246\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/fundamental_data_handling\/\" class=\"menu-link\">\u57fa\u790e &#8211; \u6578\u64da\u8655\u7406<\/a><\/li>\n<li  id=\"menu-item-3290\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3290\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/non_fundamental_algebra\/\" class=\"menu-link\">\u975e\u57fa\u790e &#8211; \u6578\u8207\u4ee3\u6578<\/a><\/li>\n<li  id=\"menu-item-3288\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3288\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/non_fundamental-shape_n_space\/\" class=\"menu-link\">\u975e\u57fa\u790e &#8211; \u5ea6\u91cf\u3001\u5716\u5f62\u8207\u7a7a\u9593<\/a><\/li>\n<li  id=\"menu-item-3289\" class=\"menu-item menu-item-type-post_type menu-item-object-page menu-item-3289\"><a href=\"https:\/\/www.study-together.com\/edu\/dse-maths-core\/non_fundamental_data_handling\/\" class=\"menu-link\">\u975e\u57fa\u790e &#8211; \u6578\u64da\u8655\u7406<\/a><\/li>\n<\/ul><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>13.1. \u00a0 \u4e09\u89d2\u51fd\u6578\u7684\u5b9a\u7fa9 \u4e09\u89d2\u6bd4\u51fd\u6578\u7684\u5b9a\u7fa9 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