2cos(x/2)(3^(1/2)sin(x/2)-cos(x/2))怎么化简?
问题描述：
2cos(x/2)(3^(1/2)sin(x/2)-cos(x/2))怎么化简?
答
2cos(x/2)(3^(1/2)sin(x/2)-cos(x/2))
=2√3cosx/2sinx/2-2(cosx/2)^2
=√3sinx-cosx-1
=2sin(x-π/6)-1