यदि $I_{1}=\int_{0}^{\pi / 2} x \sin x \, dx$ और $I_{2}=\int_{0}^{\pi / 2} x \cos x \, dx$ है,तो निम्नलिखित में से कौन सा सत्य है?

  • A
    $I_{1}=I_{2}$
  • B
    $I_{1}+I_{2}=0$
  • C
    $I_{1}=\frac{\pi}{2} I_{2}$
  • D
    $I_{1}+I_{2}=\frac{\pi}{2}$

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