A) \[\frac{1}{2}x\sqrt{{{x}^{2}}+{{a}^{2}}}+\frac{1}{2}{{a}^{2}}\log (x+\sqrt{{{x}^{2}}+{{a}^{2}}})+c\]
B) \[\frac{1}{2}\log ({{x}^{2}}+{{a}^{2}})+c\]
C) \[\log (x+\sqrt{{{x}^{2}}+{{a}^{2}}})+c\]
D) \[\log (x-\sqrt{{{x}^{2}}+{{a}^{2}}})+c\]
Correct Answer: C
Solution :
It is a fundamental concept.
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