化简sin(5π/6-θ)+sin(5π/6+θ)过程.

问题描述:

化简sin(5π/6-θ)+sin(5π/6+θ)过程.

原式=sin5π/6cosθ-cos5π/6sinθ+sin5π/6cosθ+cos5π/6sinθ
=2sin5π/6cosθ
=cosθ