Find the product. Write the product in rectangular form, using exact values.
-[4 cis $300 ^ { \circ }$ ] [5 $\left. \operatorname { cis } 120 ^ { \circ } \right]$
A) $- 10 - 10 \sqrt { 3 } \mathrm { i }$
B) $10 + 10 \sqrt { 3 } i$
C) $10 \sqrt { 3 } - 10 \mathrm { i }$
D) $- 10 \sqrt { 3 } + 10 \mathrm { i }$

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The Answer of Find the product. Write the product in rectangular form, using exact values.
-[4 cis $300 ^ { \circ }$ ] [5 $\left. \operatorname { cis } 120 ^ { \circ } \right]$
A) $- 10 - 10 \sqrt { 3 } \mathrm { i }$
B) $10 + 10 \sqrt { 3 } i$
C) $10 \sqrt { 3 } - 10 \mathrm { i }$
D) $- 10 \sqrt { 3 } + 10 \mathrm { i }$

Find the Product 300∘300 ^ { \circ }300∘ ] [5 cis⁡120∘]\left. \operatorname { cis } 120 ^ { \circ } \right]cis120∘]

Find the Product $300 ^ { \circ }$ ] [5 $\left. \operatorname { cis } 120 ^ { \circ } \right]$