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1. $\int_{0}^{a} \frac{1}{\sqrt{a^{2} - x^{2}}} d x = 2 ?$

A. $\frac{π}{3}$
B. $\frac{π}{3}$
C. $\frac{π}{3}$
D. $\frac{π}{3}$

Answer: Option B

Explanation:

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