यदि $y = \cos^{2}\left(\frac{5x}{2}\right) - \sin^{2}\left(\frac{5x}{2}\right)$ है,तो $\frac{d^{2}y}{dx^{2}} = $

  • A
    $-5 \sqrt{1-y^{2}}$
  • B
    $5 \sqrt{1-y^{2}}$
  • C
    $25 y$
  • D
    $-25 y$

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