$1 + \cos 2x + \cos 4x + \cos 6x = $

  • A
    $2\cos x \cos 2x \cos 3x$
  • B
    $4\sin x \cos 2x \cos 3x$
  • C
    $4\cos x \cos 2x \cos 3x$
  • D
    इनमें से कोई नहीं

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निम्नलिखित में से कौन सा सही है?

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$\sin \frac{\pi }{16} \sin \frac{3\pi }{16} \sin \frac{5\pi }{16} \sin \frac{7\pi }{16}$ का मान क्या है?

यदि $2\cos\theta + \sin\theta = 1$ है,तो $4\cos\theta + 3\sin\theta$ का मान किसके बराबर है?

यदि $\sqrt x + \frac{1}{{\sqrt x }} = 2\cos \theta$ है,तो ${x^6} + {x^{ - 6}} = $

$\frac{{\sin \theta }}{{1 - \cot \theta }} + \frac{{\cos \theta }}{{1 - \tan \theta }} = $

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