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

  • A
    $\frac{\pi}{4}$
  • B
    $0$
  • C
    $\tan ^{-1}\left(\frac{5}{4}\right)$
  • D
    $\frac{\pi}{2}$

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यदि $\operatorname{Tan}^{-1} \frac{1}{3}+\operatorname{Tan}^{-1} \frac{1}{7}+\operatorname{Tan}^{-1} \frac{1}{13}+\ldots+\operatorname{Tan}^{-1} \frac{1}{n^2+n+1}=\operatorname{Tan}^{-1} \theta$ है,तो $\theta=$

$2 \tan^{-1} \frac{1}{2} + \tan^{-1} \frac{1}{7}$ का मान ज्ञात कीजिए।

यदि $\cos ^{-1} x+\cos ^{-1} y+\cos ^{-1} z=3 \pi$ है,तो $x^{2025}+x^{2026}+x^{2027}$ का मान क्या है?

$\cos \left[ {{\tan }^{ - 1}}\frac{1}{3} + {{\tan }^{ - 1}}\frac{1}{2} \right] = $

$x$ के लिए हल करें: $\tan^{-1}\left(\frac{1-x}{1+x}\right) = \frac{1}{2} \tan^{-1} x$,जहाँ $x > 0$.

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