જો $y = A \cos(nx) + B \sin(nx)$ હોય,તો $\frac{d^2y}{dx^2} = $

  • A
    $n^2y$
  • B
    $-y$
  • C
    $-n^2y$
  • D
    આમાંથી કોઈ નહીં

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