A) \[{{\cos }^{-1}}\,\,\left( \frac{19}{35} \right)\]
B) \[{{\cos }^{-1}}\,\,\left( \frac{17}{31} \right)\]
C) \[30{}^\circ \]
D) \[90{}^\circ \]
E) None of these
Correct Answer: A
Solution :
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