यदि $f(x)=\frac{\cos ^2 x}{1+\sin ^2 x}$ है, तो $f\left(\frac{\pi}{4}\right)-3 f^{\prime}\left(\frac{\pi}{4}\right)=$

  • A
    $\frac{5}{3}$
  • B
    $\frac{11}{3}$
  • C
    $\frac{13}{9}$
  • D
    $3$

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यदि $x^y = e^{x-y}$ है,तो $\frac{dy}{dx} = $

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