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

question 175

Multiple Choice

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

• A) \(- 1.3681 - 3.7588 \mathrm { i }\)
• B) \(- 0.6946 + 3.9392 \mathrm { i }\)
• C) \(- 1.8794 - 0.6840 \mathrm { i }\)
• D) \(- 3.7588 - 1.3681 \mathrm { i }\)

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