Question

Use De Moivre's theorem to write the complex number in trigonometric form.

(cos(3pi/5)+i sin(3pi/5))^3

Answer 1

d

Answer 2

could you explain a little if you don't mind

Answer 3

multiply the angle by 3
that is all

Answer 4

(cos x + i sin x)^n = cos (nx) + i sin (nx)