f(x) = 2sinxcos^2(P/2)+cosxsinP-sinx
= sinx(1+cosP)+cosxsinP-sinx
= sinxx + sinxcosP + cosxsinP - sinx
= sinxcosP+cosxsinP
= sin(x+P)
在x=π处取最小值,0
f(x) = 2sinxcos^2(P/2)+cosxsinP-sinx
= sinx(1+cosP)+cosxsinP-sinx
= sinxx + sinxcosP + cosxsinP - sinx
= sinxcosP+cosxsinP
= sin(x+P)
在x=π处取最小值,0