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