Question

Question 15 > Evaluate and write your answer in a + bi form. Round your decimals to the nearest tenth. [3(cos 120° + isin 120°)] =

Answer 1

Qis [ 3 (cons 100 + c'sin 120°) 7 atib sola theorenn De Moivre's ( cose + i sino) MEZ Cosmo + į sinno for all angle Now 13 (cos 1200 + i sim 120°) 75 (cox 120° + c'sin 1200) 5 5 = 3 theorem by de moi vere's = 35 (con 600° + i sin 800) = 35 (coxanoo + i sin ano) 351 - i √3 - 121.5 - (210.4941)

18 given o = -35+57 ã = 30 30 - at fine ă ă that Soll we how lin To =bi + b₂ ă = a,ł + a2 if at the ão = a, b, taqbe So a. I = (3i 3% -25).(-3i+55) -g ܘܐ -19