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$\frac{1}{\sin 250^{\circ}}+\frac{\sqrt{3}}{\cos 290^{\circ}} = $

यदि $x = \sin 130^\circ \cos 80^\circ$,$y = \sin 80^\circ \cos 130^\circ$,और $z = 1 + xy$ है,तो निम्नलिखित में से कौन सा सत्य है?

सिद्ध कीजिए कि $\cos \left(\frac{3 \pi}{2}+x\right) \cos (2 \pi+x)\left[\cot \left(\frac{3 \pi}{2}-x\right)+\cot (2 \pi+x)\right]=1$.

$\cos \left(-1710^{\circ}\right)$ का मान ज्ञात कीजिए।

$\sin 50^\circ - \sin 70^\circ + \sin 10^\circ = $

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