यदि $y = \tan^{-1} \left( \frac{4x}{1 + 5x^2} \right) + \tan^{-1} \left( \frac{2 + 3x}{3 - 2x} \right)$ है,तो $\frac{dy}{dx} = $

  • A
    $\frac{1}{1 + 25x^2} + \frac{2}{1 + x^2}$
  • B
    $\frac{5}{1 + 25x^2} + \frac{2}{1 + x^2}$
  • C
    $\frac{5}{1 + 25x^2}$
  • D
    $\frac{1}{1 + 25x^2}$

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$\tan \left[ {\frac{\pi }{4} + \frac{1}{2}{{\cos }^{ - 1}}\frac{a}{b}} \right] + \tan \left[ {\frac{\pi }{4} - \frac{1}{2}{{\cos }^{ - 1}}\frac{a}{b}} \right] = $

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

$\tan \frac{1}{2} \left[ \sin^{-1} \frac{2x}{1+x^2} + \cos^{-1} \frac{1-y^2}{1+y^2} \right]$ का मान ज्ञात कीजिए,जहाँ $|x| < 1, y>0$ और $xy < 1$ है।

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

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