Question

A=B=45_​​​​ 1) SIN (A-B) =SIN A cos B - cos A sin B

Answer 1

Sin(A-B)=sin(45-45)=sin 0=0
sinAcosB-cosAsinB=1/root2×1/root2-1/root2×1/root2
=1/2-1/2=0
so lhs=rhs