MCQ
$\cos ^2\left(\frac{\pi}{8}+\frac{x}{2}\right)-\sin ^2\left(\frac{\pi}{8}-\frac{x}{2}\right)$ का मान है-
- A$\sqrt{2} \cos x$
- ✓$\frac{1}{\sqrt{2}} \cos x$
- C$2 \sin \frac{x}{2}$
- D$2 \cos \frac{x}{2}$
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