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Real Variables In Complex Equation

  1. Sep 20, 2011 #1
    Hi
    1. The problem statement, all variables and given/known data
    The problem asks to put the following expressions in z={ReA(e^i*)(e^i*)} Form

    for

    z=3cos(wt)-sin(wt)

    z=sin(wt+pi/4)+cos(wt)

    z=sin(wt)+2cos(wt-pi/3)-cos(wt)


    2. Relevant equations



    3. The attempt at a solution

    The problem is I don't even know which parts are real and imaginary because there is no i value in any of them. I used eulers equation and expand them but arrived at a equation with only one i, two cos, and a sin. Is this the right approach or am I missing the point.

    Thanks
     
  2. jcsd
  3. Sep 21, 2011 #2
    Does this make any sense?
     

    Attached Files:

  4. Sep 22, 2011 #3
    Ya That does help a lot does this mean for

    z=sin(wt)+2cos(wt+pi/4)-cos(wt)

    The Real Part would be

    Re{e^i(wt-pi/2) + 2e^i(wt-pi/3) - e^i(wt)}

    in complex phasor amplitude

    Thanks
     
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