Question

Please help! best response!
Express the complex number in trigonometric form.

4i

Answer 1

When you say trigonometric form you then mean polarform?

Answer 2

yes

Answer 3

and you know don'y know the relation how to convert?

Answer 4

no I dont

Answer 5

For the complex number a + ib can be rewritten to:
\[z=r*\cos(\theta)+i*r*\sin(\theta)\]
as you know from the graphical idea for complex numbers.
then we can just the formulars to rewirte:
\[a=r*\cos(\theta) <-> \cos(\theta)=\frac{ a }{ r }\]
\[b=r*\sin(\theta) <-> \sin(\theta)=\frac{ b }{ r }\] and
\[r=\sqrt{a ^{2}+b ^{2}}\]