यदि ${\tan ^{ - 1}}x - {\tan ^{ - 1}}y = {\tan ^{ - 1}}A$ है,तो $A$ का मान क्या होगा?

  • A
    $x - y$
  • B
    $x + y$
  • C
    $\frac{x - y}{1 + xy}$
  • D
    $\frac{x + y}{1 - xy}$

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$\begin{aligned} & 2 \sin ^{-1} x+\sin ^{-1}\left(2 x \sqrt{1-x^2}\right)+3 \cos ^{-1} x \\ & -\cos ^{-1}\left(4 x^3-3 x\right) \text{का मान ज्ञात कीजिए।}\end{aligned}$

$\tan ^{-1} \sqrt{3} - \cot ^{-1}(-\sqrt{3}) = $ . . . . . . .

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

यदि $y = \cos^{-1}\left(\frac{2x}{1+x^2}\right)$ है,तो $\frac{dy}{dx}$ ज्ञात कीजिए,जहाँ $-1 < x < 1$ है।

यदि ${\tan ^{ - 1}}\frac{{1 - x}}{{1 + x}} = \frac{1}{2}{\tan ^{ - 1}}x$ है,तो $x = $

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