1/2sin2x+√3/2cos2x=sin(2x+π/3)怎么变的求教

问题描述:

1/2sin2x+√3/2cos2x=sin(2x+π/3)怎么变的求教

(1/2)sin2x+(√3/2)cos2x
=(sin2x)cos(π/3)+(cos2x)sin(π/3)
=sin(2x+π/3)