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find the value of

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2cos120degrees+isin120degrees
asked Sep 15, 2018 in PRECALCULUS by anonymous
reshown Sep 15, 2018 by bradely
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2cos120degrees+isin120degrees=2cos120degrees+isin120degrees

                                                   =2cos(90+30)+isin(90+30)

                                                   =-2sin30+icos30

                                                   =-1+0.866i

answered Sep 18, 2018 by johnkelly Apprentice

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