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$\tan 105^\circ$ का मान ज्ञात कीजिए।

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

यदि $\cos \theta = \frac{8}{17}$ और $\theta$ $1^{st}$ चतुर्थांश में स्थित है,तो $\cos (30^\circ + \theta) + \cos (45^\circ - \theta) + \cos (120^\circ - \theta)$ का मान है

$\tan 100^\circ + \tan 125^\circ + \tan 100^\circ \tan 125^\circ = $

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

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