Challenge for the Weak 1 - P2

Contributed by: cauchy

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Difficulty: 8

This problem is tagged with cw, cw1.

The value of the integral $\int_{0}^{\frac{\pi}{2}} \frac{dx}{1 + \sin x}$ is:
A. $\frac{\pi}{2}$
B. $\frac{1}{2}$
C. $\pi$
D. $1$
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