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Q)

If $z = x -i y$ and $z^{\frac{1}{3}} = p + i q$, then $\frac{(\frac{x}{p} + \frac{y}{q})}{(p^2+q^2)}$ is equal to


( A ) $1$
( B ) $-1$
( C ) $-2$
( D ) $2$

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