1/2cosx+根号3/2sinx
=sinπ/6*cosx+cosπ/6*sinx
=sin(x+π/6)
A=1 w=1 α=π/6为啥能到成sinπ/6*cosx+cosπ/6*sinxsinπ/6=1/2cosπ/6=根号3/2这样满足两角和与差的公式