જો $P = \int_0^{3\pi} f(\cos^2 x) dx$ અને $Q = \int_0^{\pi} f(\cos^2 x) dx$ હોય,તો:

  • A
    $P - Q = 0$
  • B
    $P - 2Q = 0$
  • C
    $P - 3Q = 0$
  • D
    $P - 5Q = 0$

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