यदि $a > b > 0$ और $\sec^{-1} \left( \frac{a+b}{a-b} \right) = 2 \sin^{-1} x$ है,तो $x$ का मान ज्ञात कीजिए।

  • A
    $-\sqrt{\frac{b}{a+b}}$
  • B
    $\sqrt{\frac{b}{a+b}}$
  • C
    $-\sqrt{\frac{a}{a+b}}$
  • D
    $\sqrt{\frac{a}{a+b}}$

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$\Delta ABC$ में सामान्य संकेतों के साथ,यदि $C=90^{\circ}$ है,तो $\tan ^{-1}\left(\frac{a}{b+c}\right)+\tan ^{-1}\left(\frac{b}{c+a}\right)=$

यदि $\operatorname{Tan}^{-1}\left[\frac{1}{1+1(2)}\right]+\operatorname{Tan}^{-1}\left[\frac{1}{1+(2)(3)}\right]+\operatorname{Tan}^{-1}\left[\frac{1}{1+(3)(4)}\right]+\cdots+\operatorname{Tan}^{-1}\left[\frac{1}{1+n(n+1)}\right]=\operatorname{Tan}^{-1} \theta$ है,तो $\theta=$

$\sin^{-1} \frac{1}{\sqrt{5}} + \cot^{-1} 3$ का मान ज्ञात कीजिए।

कथन-$1$: ${\cot ^{ - 1}}\left[ {\frac{{\log (e/{x^2})}}{{\log (ex^2)}}} \right] + {\cot ^{ - 1}}\left[ {\frac{{\log (ex^2)}}{{\log (e/{x^2})}}} \right] = \frac{\pi}{2}$
कथन-$2$: ${\tan ^{ - 1}}\left[ {\frac{{1 + \log {x^2}}}{{1 - \log {x^2}}}} \right] = {\tan ^{ - 1}}1 + {\tan ^{ - 1}}(\log {x^2})$

यदि $\pi \leq x \leq 2 \pi$ है,तो $\cos^{-1}(\cos x)$ किसके बराबर है :-

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