જો $\frac{\sin ^{-1} x}{a}=\frac{\cos ^{-1} x}{b}=\frac{\tan ^{-1} y}{c}$ અને $0 < x < 1$ હોય,તો $\cos \left(\frac{\pi c}{a + b}\right)$ ની કિંમત શોધો.

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

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$4 \tan ^{-1} \frac{1}{5}-\tan ^{-1} \frac{1}{70}+\tan ^{-1} \frac{1}{99}=$

$x > 0$ માટે $\tan ^{-1} \frac{1-x}{1+x}=\frac{1}{2} \tan ^{-1} x$ ઉકેલો.

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$\cot \left(\sum\limits_{n=1}^{50} \tan ^{-1}\left(\frac{1}{1+n+n^{2}}\right)\right)$ ની કિંમત શોધો.

સમીકરણ $2\cos^{-1}x + \sin^{-1}x = \frac{11\pi}{6}$ ને

જો $\cot^{-1} \alpha + \cot^{-1} \beta = \cot^{-1} x$ હોય,તો $x = $

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