Perform the Indicated Operation $\left[ 5 \operatorname { cis } \frac { 4 \pi } { 9 } \right] ^ { 2 }$

Multiple Choice

Perform the indicated operation. Give answers in rectangular form expressing real and imaginary parts to four decimal
places.
- $\left[ 5 \operatorname { cis } \frac { 4 \pi } { 9 } \right] ^ { 2 }$

A) $- 23.4923 + 8.5505 i$
B) $8.5505 - 23.4923 \mathrm { i }$
C) $- 4.6985 + 1.7101 \mathrm { i }$
D) $4.3412 + 24.6202 \mathrm { i }$