Magnitude and phase

Discussion in 'Homework Help' started by welkin87, Dec 5, 2010.

  1. welkin87

    Thread Starter Member

    Nov 18, 2010
    I wasn't sure whether to post this in the math section or not, but here it is. I'm studying for a final exam and reviewing this semesters exam solutions. It's Signals and Systems and I need help with a problem.

    "Find the numerical magnitude and phase in radians of this function:
    e^{(15+j4)f} at f=-0.2"

    The answer:
    magnitude = .04979
    phase = -0.8

    He only gave the answer for this one, not how he got it. Any help would be much appreciated. Thanks!
  2. mik3

    Senior Member

    Feb 4, 2008

    A complex number of the form A<\Theta equals to:


    Hope this helps.