$n \in N$ के लिए,यदि $\cot ^{-1} 3+\cot ^{-1} 4+\cot ^{-1} 5+\cot ^{-1} n=\frac{\pi}{4}$ है,तो $n$ का मान ......... है।

  • A
    $70$
  • B
    $56$
  • C
    $10$
  • D
    $47$

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यदि $\frac{\pi}{4} + \sum_{p=1}^{11} \tan^{-1} \left(\frac{2^{p-1}}{1+2^{2p-1}}\right) = \tan^{-1} \alpha$ है, तो $\tan \alpha$ का मान . . . . . . है।

यदि $(\cos ^{-1} x)^2-(\sin ^{-1} x)^2 > 0$ है,तो

यदि $\tan ^{-1} x+\tan ^{-1} y=\frac{4 \pi}{5}$ है,तो $\cot ^{-1} x+\cot ^{-1} y$ 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-$2$: ${\tan ^{ - 1}}\left[ {\frac{{1 + \log {x^2}}}{{1 - \log {x^2}}}} \right] = {\tan ^{ - 1}}1 + {\tan ^{ - 1}}(\log {x^2})$

केवल मुख्य मानों को ध्यान में रखते हुए,यदि $\tan (\cos ^{ - 1}x) = \sin [\cot ^{ - 1}(1/2)]$ है,तो $x$ का मान ज्ञात कीजिए।

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