∵f（x）=[-sinx(-sinx)cos(π+x)] ／[-2cosxsin(π-x)]
=[sin²x(-cosx)] ／(-2cosxsinx)
=1/2sinx
∴最小正周期T=2π
∴函数图像的对称轴方程为x=kπ+π/2 (k∈Z)
已知函数f(x)= [sin(2π-x)sin(π+x)cos(-x-π)] ／[2cos(π-x)sin(3π-x)]
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