$$\text { If } f \text { is a differentiable function, find an expression for the derivative of } y = x ^ { 3 } f ( x ) \text {. }$$

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The Answer of $$\text { If } f \text { is a differentiable function, find an expression for the derivative of } y = x ^ { 3 } f ( x ) \text {. }$$

$\text { If } f \text { is a differentiable function, find an expression for the derivative of } y = x ^ { 3 } f ( x ) \text {. }$