A) \[2{{\tan }^{-1}}\frac{b}{a}\]
B) \[{{\tan }^{-1}}\frac{2ab}{{{a}^{2}}+{{b}^{2}}}\]
C) \[{{\tan }^{-1}}\frac{{{a}^{2}}-{{b}^{2}}}{{{a}^{2}}+{{b}^{2}}}\]
D) \[2{{\tan }^{-1}}\frac{a}{b}\]
E) None of these
Correct Answer: A
Solution :
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