Prove the identity.
sin x cos (x-y)- cos x sin (x - y) = sin y

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct

I’m confused this is what i’m doing in class but the question is confusing