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$\triangle ABC$ में,यदि $\angle C = 90^{\circ}$ है,तो $\frac{(\sin^2 A + \sin^2 B)}{(\sin^2 A - \sin^2 B)} \sin(A - B) = $

यदि $\cos 2B = \frac{\cos(A+C)}{\cos(A-C)}$ है,तो $\tan A, \tan B, \tan C$ किसमें हैं?

यदि $\theta$ तीसरे चतुर्थांश में है,तो $\sqrt{4 \sin ^4 \theta+\sin ^2 2 \theta}+4 \cos ^2\left(\frac{\pi}{4}-\frac{\theta}{2}\right)=$

यदि $a \cos \theta + b \sin \theta = m$ और $a \sin \theta - b \cos \theta = n$ है,तो ${a^2} + {b^2} = $

मान लीजिए $f_k(x) = \frac{1}{k}(\sin^k x + \cos^k x)$ जहाँ $x \in R$ और $k \ge 1$ है। तो $f_4(x) - f_6(x)$ का मान ज्ञात कीजिए।

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