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If z= x - iy and z^(""^(1)//3) = p + iq ...

If `z= x - iy and z^(""^(1)//3) = p + iq (x, y, p, q in R)` then `(((x)/(p) + (y)/(q)))/((p^(2) + q^(2)))` is equal to

A

2

B

`-1`

C

1

D

`-2`

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