三角比证明题

问题描述:

三角比证明题
证明:1)(√3/2)×sinx + (1/2)×cosx = sin(x+π/6)
2) sin(α+β)+ sin(α-β) = 2sinαcosβ
3) sin[(5π/6)-α]+sin[ (5π/6)+α] = cosα

原式左边可变为cosπ/6×sinx+sinπ/6×cosx=sin(x+π/6)证毕2)sin(α+β)+ sin(α-β) =sina*cosβ+cosa*sinβ+sina*cosβ-cosa*sinβ=2sinαcosβ3)sin[(5π/6)-α]+sin[ (5π/6)+α] =sin(5π/6)*cos...