The value of the expression \( 1(2-\omega)\left(2-\omega^{2}\right)...

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The value of the expression
\( 1(2-\omega)\left(2-\omega^{2}\right)+2(3-\omega)\left(3-\omega^{2}\right)+\ldots \)
\( \mathrm{P} \)
\( +(n-1) \cdot(n-\omega)\left(n-\omega^{2}\right) \),
WV
where, \( \omega \) is an imaginary cube root of unity, is....
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