Find the value of : \[ x^{3}-a x^{2}+2 a^{2} x+4 a^{3} \text { when } \frac{x}{a}=1-\sqrt{-3} \]

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Find the value of :
\[
x^{3}-a x^{2}+2 a^{2} x+4 a^{3} \text { when } \frac{x}{a}=1-\sqrt{-3}
\]
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