1+tanx^2等于多少?
1+tanx^2等于secx²。
计算过程如下:
1+(tanx)²=1+(sinx/cosx)²
=1+(sinx)²/(cosx)²
=1+(1-cosx²)/(cosx)²
通分 =1/cosX²=secX²
半角公式:
sin^2(α/2)=(1-cosα)/2
cos^2(α/2)=(1+cosα)/2
tan^2(α/2)=(1-cosα)/(1+cosα)
tan(α/2)=sinα/(1+cosα)=(1-cosα)/sinα
降幂公式:
sin^2(α)=(1-cos(2α))/2
cos^2(α)=(1+cos(2α))/2
tan^2(α)=(1-cos(2α))/(1+cos(2α))
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