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

यदि $\sin \theta = \sin 15^{\circ} + \sin 45^{\circ}$,जहाँ $0^{\circ} < \theta < 180^{\circ}$ है,तो $\theta =$ ($^{\circ}$ में)

सिद्ध कीजिए कि: $\sin x + \sin 3x + \sin 5x + \sin 7x = 4 \cos x \cos 2x \sin 4x$

$\cos ^2\left(\frac{\pi}{6}+\theta\right)-\sin ^2\left(\frac{\pi}{6}-\theta\right)$ का मान ज्ञात कीजिए।

यदि $\cot \alpha = \frac{1}{2}$ और $\sec \beta = -\frac{5}{3}$,जहाँ $\alpha \in \left(\pi, \frac{3\pi}{2}\right)$ और $\beta \in \left(\frac{\pi}{2}, \pi\right)$ है,तो $\tan(\alpha + \beta)$ का मान ज्ञात कीजिए।

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