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सिद्ध कीजिए कि $\cos \left( \frac{\pi}{4} + x \right) + \cos \left( \frac{\pi}{4} - x \right) = \sqrt{2} \cos x$.

$\cos 15^\circ - \sin 15^\circ$ का मान किसके बराबर है?

यदि $m \cos (\alpha+\beta)-n \cos (\alpha-\beta)=m \cos (\alpha-\beta)+n \cos (\alpha+\beta)$ है,तो $\tan \alpha \tan \beta=$

सिद्ध कीजिए कि $\cos \left(\frac{3 \pi}{4}+x\right)-\cos \left(\frac{3 \pi}{4}-x\right)=-\sqrt{2} \sin x$.

$\frac{\tan 70^o - \tan 20^o}{\tan 50^o}$ का मान ज्ञात कीजिए।

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