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Graphing trig functions

  1. May 26, 2005 #1
    i have a problem graphing trig functions such as f(x) = 2cos(3x+pi/2) -1

    i know this should be very simple but i am missing something :frown:

    can someone explain the way youd go about graphing this
    amp= 2
    period = 2pi/3
    y trans = -1
    x trans = (pi/2)/3 [right?]

    so when i try graph it my answer is wrong, what am i missing? is it something to do with the smaller period, need help , please!
  2. jcsd
  3. May 26, 2005 #2


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    HINT:[tex] \cos \left(3x+\frac{\pi}{2}\right)=-\sin 3x [/tex]

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