三角函数降幂公式.
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三角函数降幂公式.
![三角函数降幂公式.](/uploads/image/z/7278388-52-8.jpg?t=%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E9%99%8D%E5%B9%82%E5%85%AC%E5%BC%8F.)
^表示乘方,^2表示平方
sin^2(α)=(1-cos(2α))/2=versin(2α)/2
cos^2(α)=(1+cos(2α))/2=vercos(2α)/2
tan^2(α)=(1-cos(2α))/(1+cos(2α))
sin^2(α)=(1-cos(2α))/2=versin(2α)/2
cos^2(α)=(1+cos(2α))/2=vercos(2α)/2
tan^2(α)=(1-cos(2α))/(1+cos(2α))