$\tan \left(2 \tan ^{-1}\left(\frac{3}{5}\right)+\sin ^{-1}\left(\frac{5}{13}\right)\right)$ का मान ज्ञात कीजिए:

  • A
    $\frac{-291}{76}$
  • B
    $\frac{-181}{69}$
  • C
    $\frac{151}{63}$
  • D
    $\frac{220}{21}$

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यदि $0 < x < 1$ है,तो $\sqrt{1 + x^2} [\{x \cos (\cot^{-1} x) + \sin (\cot^{-1} x)\} ^2 - 1]^{\frac{1}{2}} =$ क्या होगा?

$(\tan ^{-1} x)^2+(\cot ^{-1} x)^2=\frac{5 \pi^2}{8} \Rightarrow x=$

यदि $ a + \frac{\pi}{2} < 2 \tan^{-1} x + 3 \cot^{-1} x < b $ है,तो $ a $ और $ b $ के मान ज्ञात कीजिए।

यदि $\tan^{-1} \frac{a+x}{a} + \tan^{-1} \frac{a-x}{a} = \frac{\pi}{6}$ है,तो $x^2 =$

$\sum_{i=0}^2 \cot ^{-1}\{-(i+1)\}=$ . . . . . . .

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