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Can someone explain me what happen in this step? Circuits 1

  1. Oct 2, 2016 #1
    1. The problem statement, all variables and given/known data
    http://imgur.com/tQR7Jdt
    tQR7Jdt.png
    2. Relevant equations
    xc= vm/im

    3. The attempt at a solution
    http://imgur.com/a/RwIUA
    zpEVacj.png
    Can someone please explain where did they get that pi/2 ? did they integrate 2cos(10t)or something? Thanks
     
    Last edited by a moderator: Oct 2, 2016
  2. jcsd
  3. Oct 2, 2016 #2

    gneill

    User Avatar

    Staff: Mentor

    They changed the trig function used to describe the current from a sine function to a cosine function. This just involves a phase shift.
     
  4. Oct 2, 2016 #3
    thank you i see now
     
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