![Question 3 Evaluate and write your answer in a + bi form. Round your decimals to the nearest tenth. (5(cos 120° + isin 120°)]](http://img.homeworklib.com/questions/29b4e8a0-1c9b-11eb-a8ba-d7d0f58c1e3c.png?x-oss-process=image/resize,w_560)
Homework Answers
Here I apply De Moivre's theorem to solve the problems.
![Now, [5 (los (120) tisin Given [5 (Cosizó tisin 120)) (1201)] 54.(Cors/20°+ 15 in 1200) Now, by De Moirres theorem, [cus (](http://img.homeworklib.com/questions/8ff80940-1c9b-11eb-bf03-2336122e9497.png?x-oss-process=image/resize,w_560)
![Now, for 420, 2% [63-22) + isin (0/2)] = 246 [ 0.97 - 10:26 1.08- 0.29 i = 1.08-0.29 i for, kal, ZA + isinza 2% (-0.26 +0.97i](http://img.homeworklib.com/questions/949663c0-1c9b-11eb-8a44-87ebdc5dca8a.png?x-oss-process=image/resize,w_560)
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