જો $y = \sqrt{\cos x^2 + \sqrt{\cos x^2 + \sqrt{\cos x^2 + \dots \infty}}}$ અને $\frac{dy}{dx} = \frac{f(x)}{2y - 1}$ હોય, તો $\int f(x) dx = \dots$

  • A
    $\sin x^2 + c$
  • B
    $-\sin x^2 + c$
  • C
    $\cos x^2 + c$
  • D
    $-\cos x^2 + c$

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જો $8 f(x)+6 f\left(\frac{1}{x}\right)=x+5$ અને $y=x^2 f(x)$ હોય,તો $x=-1$ આગળ $\frac{d y}{d x}$ ની કિંમત શોધો.

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