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Simplifying Complex Numbers

ACTMAT-RL1SCS

If $\sqrt { -1 } =i$, which of the following expressions is equivalent to the expression:

$$\frac { 3+2i }{ 1-i }$$

A

$5$

B

$\cfrac { 13 }{ 2 }$

C

$5i$

D

$\cfrac { 1 }{ 2 } +\cfrac { 5 }{ 2 } i$

E

Undefined.