$\int_{0}^{\pi /2}{\frac{dx}{{{a}^{2}}{{\cos }^{2}}x+{{b}^{2}}{{\sin }^{2}}x}}\,=$

  • A
    $\pi ab$
  • B
    ${\pi ^2}ab$
  • C
    $\frac{\pi }{{ab}}$
  • D
    $\frac{\pi }{{2ab}}$

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