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# Defining the modulus-argument form? watch

1. Hi there. I've recently had to self teach myself a bit about complex numbers and only have the internet as a resource. I was wondering if anybody could please explain the modulus-argument form to me seeing as looking around the internet doesnt really provide any explanations for it.

Thanks in advance for any help.
2. (Original post by Traceur)
Hi there. I've recently had to self teach myself a bit about complex numbers and only have the internet as a resource. I was wondering if anybody could please explain the modulus-argument form to me seeing as looking around the internet doesnt really provide any explanations for it.

Thanks in advance for any help.
The general form is

If z is represented in cartesian form, , then and i.e. r is the modulus of the complex number and the angle is the argument. You may also find that it is sometimes called polar form.
3. Basically, when you write , then tells you how far the point z is away from the origin, and is the angle (measured anti-clockwise) that the line Oz makes with the positive x-axis.

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