Don't Commit Careless Mistake

Calculus Level 4

\[\displaystyle \int_{0}^{\pi} \sqrt{1+4 \sin^2\left( \frac{x}{2} \right) -4 \sin\left( \frac{x}{2} \right)} \ \mathrm{d}x = \ ? \]

Practice the set Target JEE_Advanced - 2015 and boost up your preparation.
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