字典翻译 问答 其它 函数f(x)=sinx•cos(x-π/2)的最小正周期是()A.π/2B.π函数f(x)=sinx•cos(x-π/2)的最小正周期是()A.π/2B.πx05C.3π/2D.2π
问题标题:
函数f(x)=sinx•cos(x-π/2)的最小正周期是()A.π/2B.π函数f(x)=sinx•cos(x-π/2)的最小正周期是()A.π/2B.πx05C.3π/2D.2π
问题描述:

函数f(x)=sinx•cos(x-π/2)的最小正周期是()A.π/2B.π

函数f(x)=sinx•cos(x-π/2)的最小正周期是()

A.π/2B.πx05C.3π/2D.2π

刘林源回答:
  f(x)=sinx•cos(x-π/2)   =sinx•(cosx.cosπ/2+sinxsinπ/2)   =sinx(0+sinx)   =sinxsinx   =1-cos²x   最小正周期是2π.
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