Question

sinαcosα*cos2α помагите очень надо!

Answer 1

sinacosa*cos2a=1/2sin2a*cos2a=1/4sin4a

Answer 2

$sin2 alpha =2sin alpha *cos alpha \ \ sin alpha *cos alpha = frac{1}{2} sin2 alpha \ \ \ sin alpha *cos alpha *cos2 alpha = \ \ frac{1}{2} sin2 alpha *cos2 alpha = \ \ frac{1}{4} sin4 alpha$