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cos2x等于多少
更新时间: 2021-04-18 10:01:28  

1、cos2x=cos2x-sin2x

=2cos2x-1

=1-2sin2x

=(1-tan2x)/(1+tan2x)

2、k×π/2±a(k∈z)的三角函数值

当k为偶数时,等于α的同名三角函数值,前面加上一个把α看作锐角时原三角函数值的符号;

当k为奇数时,等于α的异名三角函数值,前面加上一个把α看作锐角时原三角函数值的符号。

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