If \( (x+i y)^{1 / 3}=a+i b \), then \( \frac{x}{a}+\frac{y}{b} \) ...

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If \( (x+i y)^{1 / 3}=a+i b \), then \( \frac{x}{a}+\frac{y}{b} \) is equal to:
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(1) \( 4\left(a^{2}+b^{2}\right) \)
(2) \( 4\left(a^{2}-b^{2}\right) \)
(3) \( 4\left(b^{2}-a^{2}\right) \)
(4) None of these
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