Question

sin15*cos15*cos30*sin60=?

Answer 1

$sin15*cos15*cos30*sin60= frac{1}{2}sin30*cos30*sin60=\\= frac{1}{2}* frac{1}{2}sin60*sin60= frac{1}{4}*sin^260= frac{1}{2}*( frac{ sqrt{3} }{2})^2= frac{1}{2}* frac{3}{4}= frac{3}{8}$