यदि $x^2+y^2=t-\frac{1}{t}$ और $x^4+y^4=t^2+\frac{1}{t^2}$ है, तो $\frac{dy}{dx}=$

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

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मान लीजिए कि $f(x)$ और $g(x)$ दो बार अवकलनीय फलन हैं, जैसे कि $f(x) = x^2 + g'(1)x + g''(2)$ और $g(x) = f(1)x^2 + xf'(x) + f''(x)$। तब $f(x) - g(x) =$

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