函数f(x)=(1-tan²2x)/(1+tan²2x)的最小正周期是?
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函数f(x)=(1-tan²2x)/(1+tan²2x)的最小正周期是?
函数f(x)=(1-tan²2x)/(1+tan²2x)的最小正周期是?
函数f(x)=(1-tan²2x)/(1+tan²2x)的最小正周期是?
f(x)=(1-sin²x/cos²x)/(1+sin²x/cos²x)
=(cos²x-sin²x)/(cos²x+sin²x)
=cos2x
所以T=2π/2=π