问题标题:
【已知函数f(x)满足f(cosx)=x/2(0≤x≤π),则f(-1/2)=()A.cos1/2B.π/4C.π/3D.π/2】
问题描述:
已知函数f(x)满足f(cosx)=x/2(0≤x≤π),则f(-1/2)=()
A.cos1/2
B.π/4
C.π/3
D.π/2
梁永生回答:
f(cosx)=x/2(0≤x≤π),
f(-1/2)=f(cos2/3π)=2π/3/2=π/3
选择C
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