$\tan \frac{\pi}{8}$ का मान क्या है?

  • A
    $1-\sqrt{2}$
  • B
    $-1-\sqrt{2}$
  • C
    $\sqrt{2}-1$
  • D
    $\sqrt{2}+1$

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

$\tan \frac{\pi}{8}$ का मान किसके बराबर है?

सिद्ध कीजिए कि: $\cos 4x = 1 - 8 \sin^2 x \cos^2 x$

$\tan \left(\frac{3 \pi}{16}\right)+\cot \left(\frac{3 \pi}{16}\right)=$

$\frac{\cot ^2 15^{\circ}-1}{\cot ^2 15^{\circ}+1} = $

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