यदि $180^{\circ} < \theta < 270^{\circ}$ है,तो $\sqrt{4 \sin^{4} \theta + \sin^{2} 2\theta} + 4 \cos^{2} \left(\frac{\pi}{4} - \frac{\theta}{2}\right)$ का मान ज्ञात कीजिए।

  • A
    $2$
  • B
    $4$
  • C
    $3$
  • D
    इनमें से कोई नहीं

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यदि $\tan \theta = t$ है,तो $\tan 2\theta + \sec 2\theta = $

$x$ का मान ज्ञात कीजिए जो समीकरण $2 \operatorname{cosec}^{2} 30^{\circ} + x \sin^{2} 60^{\circ} - \frac{3}{4} \tan^{2} 30^{\circ} = 10$ को संतुष्ट करता है।

यदि $A, B, C$ एक त्रिभुज के कोण हैं,तो $\sin^2 A + \sin^2 B + \sin^2 C - 2\cos A \cos B \cos C = $

$\sin 75^\circ = $

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