A) \[x=n\pi +{{\cos }^{-1}}\left( \frac{c}{\sqrt{{{a}^{2}}+{{b}^{2}}}} \right)\]
B) \[x=2n\pi -{{\tan }^{-1}}(b/a)\]
C) \[x=2n\pi -{{\tan }^{-1}}\left( \frac{b}{a} \right)\pm {{\cos }^{-1}}\left( \frac{c}{\sqrt{{{a}^{2}}+{{b}^{2}}}} \right)\]
D) \[x=2n\pi -{{\tan }^{-1}}(b/a)\pm {{\cos }^{-1}}\left( \frac{c}{\sqrt{{{a}^{2}}+{{b}^{2}}}} \right)\]
E) None of these
Correct Answer: D
Solution :
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