If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)

Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie

Argument of Complex Numbers

IsThisIt??? · 2012-04-26 11:52:08

Having trouble rapping my head around the angle of a complex number in different quadrants, especially the 4th quadrant. Take for example z=1-i When I calculate arctan(-1/1) I get -45deg. What I am unsure of is what I do with this answer. Do I add it to 270deg, which will give 225, which would lie in the 3rd quad? Do I add…

Options

26-04-2012 12:52pm

#1

IsThisIt???

Registered Users Posts: 412 ✭✭

Join Date: November 2009

Posts: 347

Having trouble rapping my head around the angle of a complex number in different quadrants, especially the 4th quadrant.

Take for example z=1-i
When I calculate arctan(-1/1) I get -45deg.
What I am unsure of is what I do with this answer.
Do I add it to 270deg, which will give 225, which would lie in the 3rd quad?
Do I add it to 360deg?

If anyone can explain this to me or link me to a place that can it would be much appreciated.

0

Comments

Options
#2 26-04-2012 3:36pm
TheBody

Registered Users Posts: 5,619 ✭✭✭

Join Date: January 2011

Posts: 5484

Maybe you should check out some videos on youtube. Maybe try this one for example:

http://www.youtube.com/watch?v=g5_ojBMubAg

0
Options
#3 26-04-2012 4:06pm
IsThisIt???

Registered Users Posts: 412 ✭✭

Join Date: November 2009

Posts: 347

Exactly what I was looking for, couldn't find a good video of it myself.

Thank you.

0
Options
#4 26-04-2012 7:56pm
TheBody

Registered Users Posts: 5,619 ✭✭✭

Join Date: January 2011

Posts: 5484

No problem. Glad I could help.

0