यदि $\log _{10}\left(\frac{x^3-y^3}{x^3+y^3}\right)=2$ है,तो $\frac{d y}{d x}=$

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

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

यदि $3 f(\cos x) + 2 f(\sin x) = 5 x$ है,तो $f^{\prime}(\cos x) + f^{\prime}(\sin x) =$

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