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Eulers Formula variant

  1. Mar 6, 2010 #1
    Eulers formula says that e^ix = cosx + isinx

    but in my text book theres another formula its e^ikx = coskx + isinkx
    i still can't figure out how they got that. Is this still eulers formula? and how do u get it in that form
     
  2. jcsd
  3. Mar 6, 2010 #2
    e^iy = cosy + isiny

    Let y = kx

    e^ikx = coskx + isinkx
     
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