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Math Help - Please help me on my Homework.

  1. #1
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    Please help me on my Homework.

    So I started working on my for my Exam and I wanted to know if I get this graph right!

    So a graph is given to me

    Please help me on my Homework.-capture-test-1.png<<< this is the graph

    So I looked for the amplitude and the period..
    and I think that the amplitude is
    [A]= 2-(-2)=4/2= 2, so amplitude is 2

    Then the period I am not really sure.... I have 2pi/4= pi/2, so I assume that the period is pi/2




    Now The example ask me to Find an equation for sine function for the graph

    So I conclude that is y=-2sin(pi/2x-pi/2) since it looks like an inverse curve for sine.

    and Now it ask me a cosine function

    So I conclude that is y= 2cos(pi/2x-pi/2)

    PLEASE HELP ME.... I wan't to know if I did it right!
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  2. #2
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    Re: Please help me on my Homework.

    No, the period is not \displaystyle \begin{align*} \frac{\pi}{2} \end{align*}. Choose a starting point on your graph, e.g. x = 0. How far do you move along the x axis until the graph repeats itself?
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  3. #3
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    Re: Please help me on my Homework.

    HI,
    No, you didn't quite get it right. The attachment shows a correct solution and how I did it:

    Please help me on my Homework.-mhftrig2.png
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