what is the value of this trigonometric expression I want to find out value of this expression
$$\cos^2 48°-\sin^2 12°$$
Just hint the starting step.Is there any any formula regarding $\cos^2 A-\sin^2 B$?

I've got a formula :
$$\cos(A+B).\cos(A-B)=\cos^2A-\sin^2B$$
so from this formula this question is now easy
$$\cos^248-\sin^212$$
$$\cos60.\cos36$$
$$\frac{\sqrt{5}+1}{8}$$
