[2 (cos 210° + i sin 210°)] [4 (cos 120°+ i sin 120°)].:o

1.	[2 (cos 210° + i sin 210°)] [4 (cos 120°+ i sin 120°)].:o
Answer» ANSWER: -4i EXPLANATION: $2( - \sqrt{3} \div 2 - i \div 2) \times 4( - 1 \div 2 + \sqrt{3} i \div 2) \\ \\ ( - \sqrt{3} - i)( - 2 + 2 \sqrt{3} i) \\ - 2 \sqrt{3} + 2i - 6i + 2 \sqrt{3} \\ - 4i$

Answer»

-4i

EXPLANATION:

$2( - \sqrt{3} \div 2 - i \div 2) \times 4( - 1 \div 2 + \sqrt{3} i \div 2) \\ \\ ( - \sqrt{3} - i)( - 2 + 2 \sqrt{3} i) \\ - 2 \sqrt{3} + 2i - 6i + 2 \sqrt{3} \\ - 4i$

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[2 (cos 210° + i sin 210°)] [4 (cos 120°+ i sin 120°)].:o​

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[2 (cos 210° + i sin 210°)] [4 (cos 120°+ i sin 120°)].:o