Question

15sin68/sin34*sin56 все решить не могу: с

Answer 1

$\[\frac{{15sin68}}{{sin34*sin56}}{\rm{ = }}\frac{{15sin68}}{{\frac{1}{2}\left( {\cos 22 - \cos 90} \right)}} = \frac{{30sin68}}{{\cos 22}} = \frac{{30\sin 68}}{{\cos \left( {90 - 68} \right)}} = 30\frac{{\sin 68}}{{\sin 68}} = 30\]$

Answer 2

$\frac{15sin68}{sin34*sin56}=\frac{15sin(2*34)}{sin34*sin(90-34)}=\frac{15*2sin34cos34}{sin34cos34}=15*2=30$