$$f ( x ) = \frac { x ^ { 3 } } { 3 } + \frac { x ^ { 2 } } { 2 } + x \sin 2 x - \frac { 3 } { 3 } + \frac { 2 } { 4 } x$$
$\frac{x\left(6\sin(2x)+x\left(2x+3\right)+3\right)-6}{6}$
$$\frac{2x^{3}+3x^{2}+6x\sin(2x)-6+3x}{6}$$
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