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(c) 2 The fundamental period of the function \( f ( x ) = \sin \left( \frac { x } { 3 } \right) + \cos \left( \frac { x } { 2 } \right) \) is \( \begin{array} { l l l l } { \text { (A) } 2 \pi } & { \text { (B) } 3 \pi } & { \text { (B) } 3 \pi } & { \text { (C) } 6 \text { . } } \end{array} \) C. \( 6 \pi \) (D) none of these \( ( D ) 12 \pi \)

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