2 Let \(\mathrm { f } ( x ) = 4 \sin ^ { 2 } 3 x\).
- Find the value of \(\mathrm { f } ^ { \prime } \left( \frac { 1 } { 4 } \pi \right)\).
- Find \(\int \mathrm { f } ( x ) \mathrm { d } x\).
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