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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समीकरण $x^{2}+xy+y^{2}=100$ के लिए $\frac{dy}{dx}$ ज्ञात कीजिए।

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यदि $x > 0$ और $x^y = e^{x-y}$ है, तो $\frac{dy}{dx}$ का मान ज्ञात कीजिए।

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