A) \[\frac{1}{a}{{\tan }^{-1}}\left( \frac{x}{a} \right)\]
B) \[\frac{1}{2a}{{\sin }^{-1}}\left( \frac{a-x}{a+x} \right)\]
C) \[\frac{1}{2a}\log \,\left( \frac{a+x}{a-x} \right)\]
D) \[\frac{1}{2a}\log \,\left( \frac{a-x}{a+x} \right)\]
Correct Answer: C
Solution :
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