$\tan ^2(\sec ^{-1} 4) + \cot ^2(\operatorname{cosec}^{-1} 3)$ નું મૂલ્ય શોધો.

  • A
    $15$
  • B
    $25$
  • C
    $23$
  • D
    $7$

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જો $\tan ^{-1} x+\tan ^{-1} y=\frac{4 \pi}{5}$ હોય,તો $\cot ^{-1} x+\cot ^{-1} y$ ની કિંમત શોધો.

$2 \tan ^{-1}\left(\frac{1}{3}\right)+\cos ^{-1}\left(\frac{3}{5}\right)=$

$\cos \left(2 \cos ^{-1} \frac{1}{5}+\sin ^{-1} \frac{1}{5}\right)$ ની કિંમત શોધો.

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

જો $\tan ^{-1} \frac{x-1}{x-2}+\tan ^{-1} \frac{x+1}{x+2}=\frac{\pi}{4}$ હોય,તો $x$ ની કિંમત શોધો.

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