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Math Help - Confusing Trig Graph

  1. #1
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    Confusing Trig Graph

    Plot the graph of Y =cos(4X) on your calculator for X = −Pi to
    Pi radians. Based on this plot, sketch a graph of the curve,
    labelling the scales and axes clearly.

    This is for a TI-83 calculator, and how would I plot the graph on paper?

    Also how would I find the period of this graph and Y = cos(4x) in radians, what would it be anyway?
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  2. #2
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    Quote Originally Posted by Viper12 View Post
    Plot the graph of Y =cos(4X) on your calculator for X = −Pi to
    Pi radians. Based on this plot, sketch a graph of the curve,
    labelling the scales and axes clearly.

    This is for a TI-83 calculator, and how would I plot the graph on paper?

    Also how would I find the period of this graph and Y = cos(4x) in radians, what would it be anyway?
    for Y=cos(nX) the period is 2*pi/n

    In your case it will be 2*pi/4 = pi/2

    This means the cosine function will begin and end over the distance pi/2. Or if you like one wave of cosine will take the distance of pi/2 to complete.

    As there is no implied horizontal translation then you can begin the cosine function at (0,1). For the domain [-pi/2, pi/2] you should have 4 cosine wavelengths, 2 either side of your y axis.
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