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Math Help - How to get the equation from a graph

  1. #1
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    How to get the equation from a graph

    Hi.

    I'm trying to get an equation from a set of points and a graph but I can't figure it out.

    So far I have: Acos((pi/12)t+240)+D I hope it's correct






    I just need to find out A (amplitude) and D. A and D variate with time but I don't know how to get it. Never done any problem like this before.
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  2. #2
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    Re: How to get the equation from a graph

    There exist an infinite number of functions that will give those (finite number of) points. What you have, A cos((pi/12)t+ 240)+ D, won't work. That would have each loop going up to A+ D and Down to D- A, not varying as in your graph.
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  3. #3
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    Re: How to get the equation from a graph

    A cos((pi/12)t+ 240)+ D is not correct?

    I know that it wouldn't work because I need to find A and D. But I think cos((pi/12)t+ 240) is correct at least.
    [Acos(Bt+C)+D] ----> B and C are constant in this graphic I think.

    What kind of trigonometric function describes this graph?
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