જો $x^2+y^2=t-\frac{1}{t}$ અને $x^4+y^4=t^2+\frac{1}{t^2}$ હોય,તો $\frac{dy}{dx}=$

  • A
    $\frac{2}{x^3}$
  • B
    $\frac{2}{x^3y}$
  • C
    $\frac{1}{x^3}$
  • D
    $\frac{1}{x^3y}$

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જો $x = \exp \left\{ {{{\tan }^{ - 1}}\left( {{{y - {x^2}} \over {{x^2}}}} \right)} \right\}$ હોય,તો $\frac{dy}{dx}$ ની કિંમત શોધો.

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