MCQ
$\int\limits_0^e {\frac{{x\,\,dx}}{{\left( {x + \sqrt {{e^2} - {x^2}} } \right)\sqrt {{e^2} - {x^2}} }} =\ ........} $
- A$0$
- B$\frac{e}{2}$
- C$\frac{\pi }{2}$
- ✓$\frac{\pi }{4}$
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