If \( (x+i y)^{1 / 3}=a+i b \), where \( i=\sqrt{-1} \), then \( \left(\frac{x}{a}+\frac{y}{b}\r...
If \( (x+i y)^{1 / 3}=a+i b \), where \( i=\sqrt{-1} \), then \( \left(\frac{x}{a}+\frac{y}{b}\right) \) is equal to
(a) \( 4 a^{2} b^{2} \)
(b) \( 4\left(a^{2}-b^{2}\right) \)
(c) \( 4 a^{2}-b^{2} \)
(d) \( a^{2}+b^{2} \)
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