यदि $\tan ^{-1} 2 x+\tan ^{-1} 3 x=\frac{\pi}{4}$ है,तो $x$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{6}$
  • B
    $-\frac{1}{6}$
  • C
    $1$
  • D
    $\frac{5}{6}$

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यदि $\sin ^{-1} x < \cos ^{-1} x$ है, तो

$\cos \left[ 2\cos^{-1}\frac{1}{5} + \sin^{-1}\frac{1}{5} \right] = $

सिद्ध कीजिए कि $\sin ^{-1} \frac{8}{17}+\sin ^{-1} \frac{3}{5}=\tan ^{-1} \frac{77}{36}$

$S = \tan^{-1}\left( \frac{1}{n^2 + n + 1} \right) + \tan^{-1}\left( \frac{1}{n^2 + 3n + 3} \right) + \dots + \tan^{-1}\left( \frac{1}{1 + (n + 19)(n + 20)} \right)$ है,तो $\tan S$ का मान ज्ञात कीजिए।

यदि $x \neq n \pi, x \neq(2 n+1) \frac{\pi}{2}, n \in Z$ है,तो $\frac{\sin ^{-1}(\cos x)+\cos ^{-1}(\sin x)}{\tan ^{-1}(\cot x)+\cot ^{-1}(\tan x)}$ का मान क्या है?

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