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त्रिकोणमितीय फलन $\sin \left(-\frac{11 \pi}{3}\right)$ का मान ज्ञात कीजिए।

$\sin^{2} 51^{\circ} + \sin^{2} 39^{\circ}$ का मान है

$\frac{{\cot^2 15^\circ - 1}}{{\cot^2 15^\circ + 1}} = $

$\cos 1^\circ + \cos 2^\circ + \cos 3^\circ + \dots + \cos 180^\circ = $

$\tan 1^\circ \tan 2^\circ \tan 3^\circ \tan 4^\circ \dots \tan 89^\circ = $

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