જો $a \neq b, x \neq n \pi, n \in Z$ અને $y^2 = a^2 \cos^2 x + b^2 \sin^2 x$ હોય,તો $\frac{d^2 y}{dx^2} + y =$

  • A
    $\left( \frac{ab}{y} \right)^2$
  • B
    $\frac{1}{y} \left( \frac{ab}{y} \right)^2$
  • C
    $\frac{(ab)^2}{y}$
  • D
    $\frac{ab}{y^3}$

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