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Math Help - sinusoidal function need help!

  1. #1
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    sinusoidal function need help!

    sinusoidal function need help!
    need this asap for a test and i don't know how to solve it when it doesn't have an x in the equation

    problem is : find the a, b, c ,d of y=25sin(1.3pi+0.4pi*t)+28


    i know a is 25
    d is 28
    how to solve b and c?
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  2. #2
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    Re: sinusoidal function need help!

    We don't know what a,b,c,d mean so we cant help you.
    Thanks from shanhuawu60474
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  3. #3
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    Re: sinusoidal function need help!

    a is amplitude
    b is period
    c is phase shift
    d is mean
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  4. #4
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    Re: sinusoidal function need help!

    a is amplitude
    b is period
    c is phase shift
    d is mean
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  5. #5
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    Re: sinusoidal function need help!

    a is amplitude
    b is period
    c is phase shift
    d is mean
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  6. #6
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    Re: sinusoidal function need help!

    Try not to spam click when you post... you made 2 thread and now you posted the same thing 3 times.

    When your function is in the form
    y= Msin(\theta t+ \phi)+j where k and j are constants
    The maximum value of the sine of an angle is 1 so the maximum value of sin(\theta t+ \phi) is just 1
    The amplitude is the maximum value of the function which is y= M\cdot 1+j
    So the amplitude is M+j not just the number in front of the sin.

    The phase shift is the amount the angle is constantly shifted by, the phase shift is [tex]\phi[\tex]

    The function repeats itself after the angle has gone through 2\pi radians. The period is how long it takes to go through 2\pi radians. This is the value of t so that \theta t= 2\pi

    Since the sine of a changing angle is sometimes positive and sometimes negative the positives and negatives cancel out and the mean of Msin(\alpha t) is 0. Where \alpha is a constant.
    As the mean of Msin(\theta t+ \phi) is 0, the mean of Msin(\theta t+ \phi)+j is j.
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  7. #7
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    Re: sinusoidal function need help!

    In the form y=a sin b(x-c) +d ... b is NOT the period. b/(2pi) is the period.

    Also t is the variable NOT x.
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