1-cos2x=多少？ 求关于sin cos tan arctan等等之间转化的所有公式，以前学的全忘了 哎
2011-4-26 1-cos2x=\u591a\u5c11\uff1f \u6c42\u5173\u4e8esin cos tan arctan\u7b49\u7b49\u4e4b\u95f4\u8f6c\u5316\u7684\u6240\u6709\u516c\u5f0fcos\u5e73\u65b9x
\u516c\u5f0f\u4e00\uff1a \u8bbe\u03b1\u4e3a\u4efb\u610f\u89d2\uff0c\u7ec8\u8fb9\u76f8\u540c\u7684\u89d2\u7684\u540c\u4e00\u4e09\u89d2\u51fd\u6570\u7684\u503c\u76f8\u7b49\uff1a \u3000\u3000sin\uff082k\u03c0+\u03b1\uff09=sin\u03b1 k\u2208z \u3000\u3000cos\uff082k\u03c0+\u03b1\uff09=cos\u03b1 k\u2208z \u3000\u3000tan\uff082k\u03c0+\u03b1\uff09=tan\u03b1 k\u2208z \u3000\u3000cot\uff082k\u03c0+\u03b1\uff09=cot\u03b1 k\u2208z \u3000\u3000sec\uff082k\u03c0+\u03b1\uff09=sec\u03b1 k\u2208z \u3000\u3000csc\uff082k\u03c0+\u03b1\uff09=csc\u03b1 k\u2208z \u3000\u3000
\u516c\u5f0f\u4e8c\uff1a \u8bbe\u03b1\u4e3a\u4efb\u610f\u89d2\uff0c\u03c0+\u03b1\u7684\u4e09\u89d2\u51fd\u6570\u503c\u4e0e\u03b1\u7684\u4e09\u89d2\u51fd\u6570\u503c\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a \u3000\u3000sin\uff08\u03c0+\u03b1\uff09=\uff0dsin\u03b1 \u3000\u3000cos\uff08\u03c0+\u03b1\uff09=\uff0dcos\u03b1 \u3000\u3000tan\uff08\u03c0+\u03b1\uff09=tan\u03b1 \u3000\u3000cot\uff08\u03c0+\u03b1\uff09=cot\u03b1 \u3000\u3000sec(\u03c0+\u03b1)=-sec\u03b1 \u3000\u3000csc(\u03c0+\u03b1)=-csc\u03b1 \u3000\u3000
\u516c\u5f0f\u4e09\uff1a \u4efb\u610f\u89d2\u03b1\u4e0e -\u03b1\u7684\u4e09\u89d2\u51fd\u6570\u503c\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a \u3000\u3000sin\uff08\uff0d\u03b1\uff09=\uff0dsin\u03b1 \u3000\u3000cos\uff08\uff0d\u03b1\uff09=cos\u03b1 \u3000\u3000tan\uff08\uff0d\u03b1\uff09=\uff0dtan\u03b1 \u3000\u3000cot\uff08\uff0d\u03b1\uff09=\uff0dcot\u03b1 \u3000\u3000sec(-\u03b1)=sec\u03b1 \u3000\u3000csc(-\u03b1)=-csc\u03b1 \u3000\u3000
\u516c\u5f0f\u56db\uff1a \u5229\u7528\u516c\u5f0f\u4e8c\u548c\u516c\u5f0f\u4e09\u53ef\u4ee5\u5f97\u5230\u03c0-\u03b1\u4e0e\u03b1\u7684\u4e09\u89d2\u51fd\u6570\u503c\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a \u3000\u3000sin\uff08\u03c0\uff0d\u03b1\uff09=sin\u03b1 \u3000\u3000cos\uff08\u03c0\uff0d\u03b1\uff09=\uff0dcos\u03b1 \u3000\u3000tan\uff08\u03c0\uff0d\u03b1\uff09=\uff0dtan\u03b1 \u3000\u3000cot\uff08\u03c0\uff0d\u03b1\uff09=\uff0dcot\u03b1 \u3000\u3000sec(\u03c0-\u03b1)=-sec\u03b1 \u3000\u3000csc(\u03c0-\u03b1)=csc\u03b1 \u3000\u3000
\u516c\u5f0f\u4e94\uff1a \u5229\u7528\u516c\u5f0f\u4e00\u548c\u516c\u5f0f\u4e09\u53ef\u4ee5\u5f97\u52302\u03c0-\u03b1\u4e0e\u03b1\u7684\u4e09\u89d2\u51fd\u6570\u503c\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a \u3000\u3000sin\uff082\u03c0\uff0d\u03b1\uff09=\uff0dsin\u03b1 \u3000\u3000cos\uff082\u03c0\uff0d\u03b1\uff09=cos\u03b1 \u3000\u3000tan\uff082\u03c0\uff0d\u03b1\uff09=\uff0dtan\u03b1 \u3000\u3000cot\uff082\u03c0\uff0d\u03b1\uff09=\uff0dcot\u03b1 \u3000\u3000sec(2\u03c0-\u03b1)=sec\u03b1 \u3000\u3000csc(2\u03c0-\u03b1)=-csc\u03b1 \u3000\u3000
\u516c\u5f0f\u516d\uff1a \u03c0/2\u00b1\u03b1\u4e0e\u03b1\u7684\u4e09\u89d2\u51fd\u6570\u503c\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a \u3000\u3000sin\uff08\u03c0/2+\u03b1\uff09=cos\u03b1 \u3000\u3000cos\uff08\u03c0/2+\u03b1\uff09=\uff0dsin\u03b1 \u3000\u3000tan\uff08\u03c0/2+\u03b1\uff09=\uff0dcot\u03b1 \u3000\u3000cot\uff08\u03c0/2+\u03b1\uff09=\uff0dtan\u03b1 \u3000\u3000sec(\u03c0/2+\u03b1)=-csc\u03b1 \u3000\u3000csc(\u03c0/2+\u03b1)=sec\u03b1 \u3000\u3000sin\uff08\u03c0/2\uff0d\u03b1\uff09=cos\u03b1 \u3000\u3000cos\uff08\u03c0/2\uff0d\u03b1\uff09=sin\u03b1 \u3000\u3000tan\uff08\u03c0/2\uff0d\u03b1\uff09=cot\u03b1 \u3000\u3000cot\uff08\u03c0/2\uff0d\u03b1\uff09=tan\u03b1 \u3000\u3000sec(\u03c0/2-\u03b1)=csc\u03b1 \u3000\u3000csc(\u03c0/2-\u03b1)=sec\u03b1 \u3000\u3000
\u63a8\u7b97\u516c\u5f0f\uff1a3\u03c0/2\u00b1\u03b1\u4e0e\u03b1\u7684\u4e09\u89d2\u51fd\u6570\u503c\u4e4b\u95f4\u7684\u5173\u7cfb\uff1a \u3000\u3000sin\uff083\u03c0/2+\u03b1\uff09=\uff0dcos\u03b1 \u3000\u3000cos\uff083\u03c0/2+\u03b1\uff09=sin\u03b1 \u3000\u3000tan\uff083\u03c0/2+\u03b1\uff09=\uff0dcot\u03b1 \u3000\u3000cot\uff083\u03c0/2+\u03b1\uff09=\uff0dtan\u03b1 \u3000\u3000sec(3\u03c0/2+\u03b1)=csc\u03b1 \u3000\u3000csc(3\u03c0/2+\u03b1)=-sec\u03b1 \u3000\u3000sin\uff083\u03c0/2\uff0d\u03b1\uff09=\uff0dcos\u03b1 \u3000\u3000cos\uff083\u03c0/2\uff0d\u03b1\uff09=\uff0dsin\u03b1 \u3000\u3000tan\uff083\u03c0/2\uff0d\u03b1\uff09=cot\u03b1 \u3000\u3000cot\uff083\u03c0/2\uff0d\u03b1\uff09=tan\u03b1 \u3000\u3000sec(3\u03c0/2-\u03b1)=-csc\u03b1 \u3000\u3000csc(3\u03c0/2-\u03b1)=-sec\u03b1[1] \u3000\u3000
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sin^2x+cos^2x=1
sinx/cosx=tanx
1-cos2x=2*（sinx）^2
1-cos2x=1-[1-2（sinx）^2]=2（sinx）^2
cos2x=(cosx)^2-(sinx)^2=2(cosx)^2-1=1-2(sinx)^2
1-cos2x=2(sinx)^2
sin^x+cos^x=1
sinx/cosx=tanx
扩展阅读：1- cos 2 x等价于多少 ... 1-cos2x除以2等于多少 ... 万能计算器 ... y=cos2x ... 1-cos 2x等于什么 ... 1-cos2x等于多少极限 ... cos值在线计算器 ... 1-cos2x的极限怎么求 ... cos2x二倍角公式 ...
