A) \[\sqrt{{{x}^{2}}+{{a}^{2}}}\]
B) \[\frac{1}{\sqrt{{{x}^{2}}+{{a}^{2}}}}\]
C) \[2\sqrt{{{x}^{2}}+{{a}^{2}}}\]
D) \[\frac{2}{\sqrt{{{x}^{2}}+{{a}^{2}}}}\]
Correct Answer: A
Solution :
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