Find All Cube Roots of the Complex Number $64 \operatorname { cis } 120 ^ { \circ }$

question 46

Multiple Choice

Find all cube roots of the complex number. Leave answers in trigonometric form.
- $64 \operatorname { cis } 120 ^ { \circ }$

• A) \(4 \left( \frac { \sqrt { 3 } } { 2 } + \frac { 1 } { 2 } \mathrm { i } \right) , 4 \left( - \frac { \sqrt { 3 } } { 2 } + \frac { 1 } { 2 } \mathrm { i } \right) , 4 \left( \frac { \sqrt { 3 } } { 2 } - \frac { 1 } { 2 } \mathrm { i } \right)\)
• B) \(4 ( .7660 + .6428 \mathrm { i } ) , 4 ( - .9397 + .3420 \mathrm { i } ) , 4 ( .1736 - .9848 \mathrm { i } )\)
• C) \(4 \left( - \frac { 1 } { 2 } + \frac { \sqrt { 3 } } { 2 } \mathrm { i } \right) , 4 \left( \frac { 1 } { 2 } \mathrm { i } - \frac { \sqrt { 3 } } { 2 } \right) , 4 \left( \frac { 1 } { 2 } + \frac { \sqrt { 3 } } { 2 } \mathrm { i } \right)\)
• D) \(4 ( .6428 + .7660 \mathrm { i } ) , 4 ( - .3420 + .9397 \mathrm { i } ) , 4 ( .9848 - .1736 \mathrm { i } )\)

Describe the structure and functionality of working memory, including its components.

Understand the concepts of primacy and recency effects in memory recall.

Discuss the limitations of memory capacity and strategies to overcome them.

Recognize the factors that influence forgetting and memory decay.

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