KcetTrigonometric Ratios And IdentitiesKCET 2017MCQ+1 / -02017The value of $\cos ^2 45^{\circ}-\sin ^2 15^{\circ}$ isA $\frac{\sqrt{2}+1}{2 \sqrt{2}}$B$\frac{\sqrt{3}-1}{2 \sqrt{2}}$C $\frac{\sqrt{3}}{2}$D $\frac{\sqrt{3}}{4}$Check AnswerClear SelectionReveal AnswerShow Explanation