यदि $\frac{\sin ^{-1} x}{a}=\frac{\cos ^{-1} x}{b}=\frac{\tan ^{-1} y}{c}$ और $0 < x < 1$ है,तो $\cos \left(\frac{\pi c}{a + b}\right)$ का मान ज्ञात कीजिए।

  • 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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यदि $3 \cos ^{-1} x + \sin ^{-1} x = \pi$ है,तो $x = $ . . . . . . .

$\sin ^{-1} \frac{12}{13}+\cos ^{-1} \frac{4}{5}+\tan ^{-1} \frac{63}{16}$ का मान क्या है?

$\sin \left[\tan ^{-1}\left(\frac{1-x^2}{2 x}\right)+\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right)\right]$ का मान है

यदि $\tan ^{-1}\left[\frac{1}{1+1 \cdot 2}\right]+\tan ^{-1}\left[\frac{1}{1+2 \cdot 3}\right]+\cdots+\tan ^{-1}\left[\frac{1}{1+n(n+1)}\right]=\tan ^{-1}[x]$ है,तो $x=$

यदि $\tan ^{-1} x+\tan ^{-1} y=\frac{4 \pi}{5}$ है,तो $\cot ^{-1} x+\cot ^{-1} y$ का मान ज्ञात कीजिए।

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