L littlered Oct 2019 1 0 Utah Oct 21, 2019 #1 The instructions for this problem is to verify the identity. Thank you for your help! (sin3xcos5x-sinxcos7x) / (sinxsin7x+cos3xcos5x) = tan2x

The instructions for this problem is to verify the identity. Thank you for your help! (sin3xcos5x-sinxcos7x) / (sinxsin7x+cos3xcos5x) = tan2x

tahirimanov19 Mar 2015 182 68 Universe 2.71828i3.14159 Oct 22, 2019 #2 Calculate numerator using $\sin \alpha \cdot \cos \beta$ and denominator using $\sin \alpha \cdot \sin \beta$ & $\cos \alpha \cdot \cos \beta$. Rest is easy.

Calculate numerator using $\sin \alpha \cdot \cos \beta$ and denominator using $\sin \alpha \cdot \sin \beta$ & $\cos \alpha \cdot \cos \beta$. Rest is easy.