$2\cos x - \cos 3x - \cos 5x = $

  • A
    $16\cos^3 x \sin^2 x$
  • B
    $16\sin^3 x \cos^2 x$
  • C
    $4\cos^3 x \sin^2 x$
  • D
    $4\sin^3 x \cos^2 x$

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$\frac{\sin^3 \theta - \cos^3 \theta}{\sin \theta - \cos \theta} - \frac{\cos \theta}{\sqrt{1 + \cot^2 \theta}} - 2 \tan \theta \cot \theta = -1$ यदि

एक $\Delta ABC$ में,$\sin A \cos B \cos C + \sin B \cos C \cos A + \sin C \cos A \cos B$ का मान है:

यदि $\tan A = \frac{n}{n+1}$ और $\tan B = \frac{1}{2n+1}$ है,तो $\tan (A+B)$ का मान ज्ञात कीजिए।

यदि $\alpha$,$25\cos^2\theta + 5\cos\theta - 12 = 0$ का एक मूल है और $\pi/2 < \alpha < \pi$ है,तो $\sin 2\alpha$ का मान ज्ञात कीजिए।

यदि $A + B + C = \frac{3\pi}{2}$ है,तो $\cos 2A + \cos 2B + \cos 2C = $

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