यदि $x^2+y^2=t+\frac{1}{t}$ और $x^4+y^4=t^2+\frac{1}{t^2}$ है,तो $x^3 y \frac{dy}{dx}$ का मान क्या होगा?

  • A
    $-1$
  • B
    $1$
  • C
    $0$
  • D
    $t$

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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।

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