(1)
F(0)=sinα+sin(-α)=0
f(π/2)=1+sin(π/2+α)+sin(π/2-α)=1+2cosα=F(0)=0
cosα=-1/2
α=(2n+1/2)π±π/6
定值为0
(2)不知道什么方程?即F(x)等于什么不知道