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यदि $\sin \theta = \frac{3}{5}$ और $\theta$ प्रथम चतुर्थांश में नहीं है,तो $15 \sin 2 \theta - 20 \cos 2 \theta - 7 \tan 2 \theta = $

यदि $\cos x = -\frac{1}{3}$ और $x$ चतुर्थांश $III$ में स्थित है,तो $\sin \frac{x}{2}, \cos \frac{x}{2}$ और $\tan \frac{x}{2}$ का मान ज्ञात कीजिए।

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यदि $630^{\circ} < \theta < 810^{\circ}$ और $\tan \theta = -\frac{7}{24}$ है,तो $\cos \left(\frac{\theta}{4}\right) = $

सिद्ध कीजिए कि $\tan 3x \tan 2x \tan x = \tan 3x - \tan 2x - \tan x$.

$\cot x - \tan x = $

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