- I understand that (from the Argand Diagram). Is there an algebraic way to show that ?
- Why is the principal value of the argument taken to be between and ? I was asked to find the modulus and argument of . Here is what I did:
. Right.
. Obviously that isn't between & . What am I supposed to do then?
PS. For the last part (as noticed by Archie Meade), I meant: .
I understand one (using pythagoras' theorem). What is the other? And is there any other way to show it apart from plotting the Argand Diagram?
Thank you. That is what I have been missing.
That was a mistake. What I meant was
I could see that. But I was measuring anticlockwise from zero. I thought that the angle I needed was the acute angle I found plus 180 (measuring anticlockwise from zero).
Alright. I will do that. Little me first take a little grasp of what I've so far gathered.