设（sinx)=2-cos2x,则f(cosπ/6)=?
问题描述：
设（sinx)=2-cos2x,则f(cosπ/6)=?
答
原式=f[sin(0/2-π/6)]
=f(sin(π/3))
=2-cos(2*π/3)
=2-(-1/2)
=5/2