यदि $\tan \theta - \cot \theta = a$ और $\sin \theta + \cos \theta = b$ है,तो ${({b^2} - 1)^2}({a^2} + 4)$ का मान ज्ञात कीजिए।

  • A
    $2$
  • B
    $-4$
  • C
    $\pm 4$
  • D
    $4$

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यदि $\sin x + \sin y = 3(\cos y - \cos x)$ है,तो $\frac{\sin 3x}{\sin 3y}$ का मान क्या है?

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मान लीजिए $\frac{\pi}{2} < \theta < \pi$ और $\cot \theta = -\frac{1}{2 \sqrt{2}}$ है। तब $\sin (\frac{15 \theta}{2}) (\cos 8 \theta + \sin 8 \theta) + \cos (\frac{15 \theta}{2}) (\cos 8 \theta - \sin 8 \theta)$ का मान ज्ञात कीजिए:

$16 \sin 12^{\circ} \cos 18^{\circ} \sin 48^{\circ} = $

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