Question:
Mark $(\sqrt{)}$ against the correct answer in the following:
$\int_{0}^{1} \frac{1}{\left(1+x^{2}\right)} d x=?$
A. $\frac{\pi}{2}$
B. $\frac{\pi}{3}$
C. $\frac{\pi}{4}$
D. none of these
Solution:
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