यदि $\cos A = \frac{3}{4}$ है,तो $32\sin \left( \frac{A}{2} \right)\sin \left( \frac{5A}{2} \right) = $

  • A
    $7$
  • B
    $8$
  • C
    $11$
  • D
    इनमें से कोई नहीं

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यदि $\theta = \frac{\pi}{9}$ है,तो $1 + 27 \tan^2 \theta - 33 \tan^4 \theta + \tan^6 \theta = $

सिद्ध कीजिए कि: $\cos 6x = 32 \cos^6 x - 48 \cos^4 x + 18 \cos^2 x - 1$

यदि $\sin(\frac{\pi}{18}) \sin(\frac{5\pi}{18}) \sin(\frac{7\pi}{18}) = K$ है, तो $\sin(\frac{10K\pi}{3})$ का मान ज्ञात कीजिए:

$\cos 15^\circ = $

$\frac{\sec 8\theta - 1}{\sec 4\theta - 1}$ किसके बराबर है?

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