A) \[{{\cos }^{-1}}\left( \frac{a\cos \theta +b}{a+b\cos \theta } \right)\]
B) \[{{\cos }^{-1}}\left( \frac{a+b\cos \theta }{a\cos \theta +b} \right)\]
C) \[{{\cos }^{-1}}\left( \frac{a\cos \theta }{a+b\cos \theta } \right)\]
D) \[{{\cos }^{-1}}\left( \frac{b\cos \theta }{a\cos \theta +b} \right)\]
E) None of these
Correct Answer: A
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