Question

please show how to complete question 4&5. thank you.

4. Find polar form of the following complex numbers: i-1, 2i+2, sin(3/7) + i cos(31/7), cos(28/7) - i sin(2/7). 5. Let a = cos(3) + i sin(*), b = cos(5) + i sin(5). Find polar form for ab, a/b. Find real and imaginary parts of a" and 649

Answer 1

i-1 ID onitude = [(-1)²+(11" : 52 Angle, Bi feris () : tenis (6) -- ous S : Polar form 52 <-45 edia , Cos@ + i sin e sm + i as enige an ez aos (90-0) and cast = sm (90-0) isim sorsas (1-3) = 65 0739son (-3) - sen i = cos T + i scene = ej"/7 = < 7 or 125.712² (11) was 21 - ism - ism? F =é -12-31 <1- 51.428

| boss + Sin [ ) ? ? : n. =1< n or |< 705.7% cl<-” |<-51.43° tt : ) tes": ( 22n + (lio 32n) Con 人v 2 (-

а е . е = (cos 34n tjom 347) (ast +jsme)

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