Question

三角函数化简，要详细过程。

Answer 1

sin(5π-α)=sin(π-α)=sinαcos(α-7π/2)=cos(α-7π/2+4π)=cos(π/2+α)=-sinαsin(5π/2+α)=sin(π/2+α)=cosαcos(3π-α)=cos(π-α)=-cosα原式=（sinα+sinα）/（cosα+cosα）=tanα

Answer 2

原式＝1/2+sin30°cos2x＋sin2xcos30°
＝1/2+sin(2x＋30°)