A) \[{{\cos }^{-1}}\left( \frac{1}{10} \right)\]
B) \[{{\cos }^{-1}}\left( \frac{9}{11} \right)\]
C) \[{{\cos }^{-1}}\left( \frac{9}{91} \right)\]
D) \[{{\cos }^{-1}}\left( \frac{1}{9} \right)\]
Correct Answer: C
Solution :
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