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यदि $\left| \cos \theta \left\{ \sin \theta + \sqrt{\sin^2 \theta + \sin^2 \alpha} \right\} \right| \le k$ है,तो $k$ का मान क्या है?

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समीकरण $(a + b)^2 = 4ab \sin^2 \theta$ केवल तब संभव है जब

यदि $ABC$ एक समकोण त्रिभुज नहीं है और $\sin \left(\frac{\pi}{4}-A\right) \sin \left(\frac{\pi}{4}-B\right) = -\frac{1}{2 \sqrt{2}} \operatorname{cosec}\left(\frac{\pi}{4}-C\right)$ है,तो $\tan A \tan B + \tan B \tan C + \tan C \tan A = $

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