Question

Sin^2(a+b)-sin^2(a-b) = sin2a.sin2b

Answer 1

consider (a+b)=A , (a-b)=B

formula: sin^A - sin^2B= sin (A+B).sin(A

-B)

sin^2(a+b)-sin^2(a-b) = sin(a+b+a-b).

sin(a+b-a+b)

=sin2a.sin2b