यदि $\tan x = \frac{3}{4}$ और $\pi < x < \frac{3\pi}{2}$ है,तो $\cos \frac{x}{2}$ का मान ज्ञात कीजिए।

  • A
    $\frac{3}{\sqrt{10}}$
  • B
    $-\frac{3}{\sqrt{10}}$
  • C
    $-\frac{1}{\sqrt{10}}$
  • D
    $\frac{1}{\sqrt{10}}$

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यदि $\sec x = \frac{25}{24}$ और $x$ प्रथम चतुर्थांश में स्थित है,तो $\sin \frac{x}{2} + \cos \frac{x}{2} =$

$4 \cos^3 20^{\circ}$ का मान क्या है?

$(4 \cos^2 9^{\circ} - 3)(4 \cos^2 27^{\circ} - 3) = $

सिद्ध कीजिए कि $\sin 2x + 2 \sin 4x + \sin 6x = 4 \cos^2 x \sin 4x$.

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