Arithmetic operations for functions

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Let $f\left( x \right) = 3 \cdot x - x^{3}$ and $g\left( x \right) = x^{3}$ .

Calculate $\left( f + g \right)\left( x \right)$ and $\left( f - g \right)\left( x \right)$ .

$\left( f + g \right)\left( x \right) =$

$\left( f - g \right)\left( x \right) =$

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