Find All Cube Roots of the Complex Number $64 \mathrm { i }$

question 256

Multiple Choice

Find all cube roots of the complex number. Leave answers in trigonometric form.
- $64 \mathrm { i }$

• A) \(1 , - 1 , - i\)
• B) \(4 \operatorname { cis } 0 ^ { \circ } , 4 \operatorname { cis } 120 ^ { \circ } , 4 \operatorname { cis } 240 ^ { \circ }\)
• C) \(4 \operatorname { cis } 30 ^ { \circ } , 4 \operatorname { cis } 150 ^ { \circ } , 4 \operatorname { cis } 270 ^ { \circ }\)
• D) \(4 \operatorname { cis } 60 ^ { \circ } , 4 \operatorname { cis } 180 ^ { \circ } , 4 \operatorname { cis } 300 ^ { \circ }\)

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