Question

The value of ${\cos }^{2}48^{\circ }-{\sin }^{2}12^{\circ }$ is

• A. $\frac{\sqrt{5}+1}{8}$
• B. $\frac{\sqrt{5}-1}{8}$
• C. $\frac{\sqrt{5}+1}{5}$
• D. $\frac{\sqrt{5}+1}{2\sqrt{2}}$

Answer 1

Answer: (A)

Correct answer is (a) $\frac{\sqrt{5}+1}{8}$