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Question: Answered & Verified by Expert
$\int_{-\pi / 2}^{\pi / 2} \sin ^2 x d x=$
MathematicsDefinite IntegrationJEE Main
Options:
  • A $\pi$
  • B $\frac{\pi}{2}$
  • C $\frac{\pi}{2}-\frac{1}{2}$
  • D $\pi-1$
Solution:
2923 Upvotes Verified Answer
The correct answer is: $\frac{\pi}{2}$
$\int_{-\pi / 2}^{\pi / 2} \sin ^2 x d x=2 \int_0^{\pi / 2} \sin ^2 x d x=2 \frac{\Gamma\left(\frac{3}{2}\right) \Gamma\left(\frac{1}{2}\right)}{2 \Gamma\left(\frac{2+2}{2}\right)}=\frac{\pi}{2}$

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