cos 2 1+cos2x /2 在 Show that $5\cos^2x - 2\sqrt{3}\sin x\ ... 的評價 Notice, the following formula cos2A+sin2A=1. 2sinAcosA=sin2A. cos2A−sin2A=cos2A. Now, we have. LHS=5cos2x−2√3sinx⋅cosx+3sin2x. ... <看更多>
