यदि $\log \sqrt{x^2+y^2}=\tan ^{-1}\left(\frac{x}{y}\right)$ है,तो $\frac{d y}{d x}$ का मान ज्ञात कीजिए।

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

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यदि $x^k + y^k = a^k$ $(a, k > 0)$ और $\frac{dy}{dx} + (\frac{y}{x})^{\frac{1}{3}} = 0$ है,तो $k$ का मान ज्ञात कीजिए।

यदि $2^x + 2^y = 2^{x + y}$ है,तो $\frac{dy}{dx}$ का मान किसके बराबर है?

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यदि $\tan (x + y) + \tan (x - y) = 1$ है,तो $\frac{dy}{dx} = $

यदि ${2^x} + {2^y} = {2^{x + y}}$ है,तो $x = y = 1$ पर $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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