Find the value of

Correct option is C

Given: ​

​$$\frac{ \cos^2 15^0 - \sin^2 15^0}{\cos^2 145^0 + \sin^2 145^0}$$   

Formula Used:  ​

​$$\begin{aligned}&\sin^2 \theta + \cos^2 \theta =1 \\&\cos 2 \theta = \cos^2 \theta - \sin^2 \theta \\&\cos 30^0 = \frac{ \sqrt{3}}{2} \end{aligned}$$   

Solution: