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## Homework Statement

I have the following complex numbers : -3,18 +4,19i

I must put it in polar form.

## Homework Equations

r=(a^2+b^2)^(1/2)

cos x = a/r

sin x = b/r

## The Attempt at a Solution

I was able to find with cos x = a/r that the x = 127,20

But when I do it with sin x = b/r I obtain like 52 degrees. I know that I Must obtain 127,20 for BOTH. Why isnt it working ?