જો $y = \cos^2\left(\frac{5x}{2}\right) - \sin^2\left(\frac{5x}{2}\right)$ હોય,તો $\frac{d^2y}{dx^2} =$

  • A
    $-25y$
  • B
    $\frac{25}{2}y$
  • C
    $-\frac{25}{2}y$
  • D
    $25y$

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