Question

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

Answer 1

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

Answer 2

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