Question

Помогите решить пожалуйста)(sin(a+3ß)+sin(a-3ß))/(sin(a+3ß)-sin(a-3ß))*ctga

Answer 1

2sinacos3b/2sin3bcosa *cosa/sina=cos3b/sin3b=ctg3b

Answer 2

$frac{sin( alpha +3 beta )+sin( alpha -3 beta )}{sin( alpha +3 beta )-sin( alpha -3 beta )} cdot ctg alpha = frac{2sin alpha cdot cos3 beta }{2sin3 beta cdot cos alpha } cdot frac{cos alpha }{sin alpha } =\\= frac{cos3beta }{ sin3 beta } =ctg3 beta$