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# FP1 arguments

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1. To find the "argument" you must find the angle in the triangle from the x-axis.

Do you find the argument from the positive bit of the x-axis always?
2. (Original post by timebent)
To find the "argument" you must find the angle in the triangle from the x-axis.

Do you find the argument from the positive bit of the x-axis always?
Yes by definition. It is always from the positive Re(z) axis.
3. Angle from the positive x axis yes
4. (Original post by B_9710)
Yes by definition. It is always from the positive Re(z) axis.
ok right because i was a little confused thanks
5. Yeah from the positive real axis (x). Always from the right side so the positive side 1st or 4th quadrant.

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6. Do note that in some cases the principal argument is in and in that scenario, you'll always measure anti-clockwise from the positive real axis. In other cases, however, the principal argument branch cut is and in that case, you'll measure counterclockwise for positive angles and clockwise for negative angles.
7. (Original post by Zacken)
Do note that in some cases the principal argument is in and in that scenario, you'll always measure anti-clockwise from the positive real axis. In other cases, however, the principal argument branch cut is and in that case, you'll measure counterclockwise for positive angles and clockwise for negative angles.
is it? that's interesting, what sort of cases would these be?
i just though generally the values taken could range from negative pi all the way to positive pi only
8. (Original post by timebent)
is it? that's interesting, what sort of cases would these be?
i just though generally the values taken could range from negative pi all the way to positive pi only
Some people prefer to use others prefer , it comes down to a matter of taste. In exams, you'll either be specified which or you can use either if not specified.
9. (Original post by Zacken)
Some people prefer to use others prefer , it comes down to a matter of taste. In exams, you'll either be specified which or you can use either if not specified.
Ah right i see. Thanks!
10. (Original post by timebent)
Ah right i see. Thanks!
You'll come across some examples and questions later on in FP1 when you learn about significance of the 4 different quadrants and how they determine the argument (in terms of how it's worked out and how it's measured).

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11. (Original post by Chittesh14)
You'll come across some examples and questions later on in FP1 when you learn about significance of the 4 different quadrants and how they determine the argument (in terms of how it's worked out and how it's measured).

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sounds fun, teaching myself it too much fun xD
probably better than learning something like stats, i hear from all my stats buddies about all the weird symbols and sign you gotta use to specify whatever lol
12. (Original post by Zacken)
Some people prefer to use others prefer , it comes down to a matter of taste. In exams, you'll either be specified which or you can use either if not specified.
In exams I think the exam boards expect you to use -pi to pi as the argument range.
13. (Original post by an_atheist)
In exams I think the exam boards expect you to use -pi to pi as the argument range.
Yeah, that's what's In my book too.

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14. (Original post by an_atheist)
In exams I think the exam boards expect you to use -pi to pi as the argument range.
I prefer and use that myself, haven't been penalised. (Edexcel)
15. Should say in the question whether it is .

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