निम्नलिखित में से कौन सा सत्य है?

  • A
    $\int_{a}^{\pi - a} x f(\sin x) dx = \frac{\pi}{2} \int_{a}^{\pi - a} f(\sin x) dx$
  • B
    $\int_{-a}^{a} f(x)^2 dx = 2 \int_{0}^{a} f(x)^2 dx$
  • C
    $\int_{0}^{n\pi} f(\cos^2 x) dx = n \int_{0}^{\pi} f(\cos^2 x) dx$
  • D
    उपरोक्त सभी

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