Question

1- sin^2 beta - sin ^2 alpha + sin^2 alpha* sin^2beta - sin^2alpha*sin^2 beta.

Can you show me how to scrape it, it has to be ecal to 1 - sin^2 alpha - sin^2 beta

Answer 1

doesn't this cancel out and u get 0 ??
+ sin^2 alpha* sin^2beta - sin^2alpha*sin^2 beta.
+a-a=0
they are same terms if u did not realize....

Answer 2

and u get what u want....