यदि $\theta = \tan^{-1} a$,$\phi = \tan^{-1} b$ और $ab = -1$ है,तो $\theta - \phi = $

  • A
    $0$
  • B
    $\frac{\pi}{4}$
  • C
    $\frac{\pi}{2}$
  • D
    इनमें से कोई नहीं

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Similar Questions

$\tan ^{-1}(x+1)+\cot ^{-1}\left(\frac{1}{x-1}\right)=\tan ^{-1}\left(\frac{8}{31}\right)$ के लिए $x$ के संभावित मानों का योग क्या है?

$\tan^{-1} \left( \frac{\sqrt{1 + x^2} - 1}{x} \right) = $

$\tan \left[ 2\tan^{-1}\left( \frac{1}{5} \right) - \frac{\pi}{4} \right] = $

यदि $y = \tan^{-1}\left(\frac{1}{x^2 + x + 1}\right) + \tan^{-1}\left(\frac{1}{x^2 + 3x + 3}\right) + \tan^{-1}\left(\frac{1}{x^2 + 5x + 7}\right) + \dots$ $n$ पदों तक है,तो $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

Difficult
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$\cot \left(\sum\limits_{n=1}^{50} \tan ^{-1}\left(\frac{1}{1+n+n^{2}}\right)\right)$ का मान ज्ञात कीजिए।

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