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Thread: how to find equation?

  1. November 14th 2012, 04:32 PM #1
    ahmedb
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    how to find equation?

    Google Image Result for http://www.eetasia.com/IMAGES/EEOL_2008MAR15_POW_NT_01_fig1.jpg

    how can i get the equation of the function in red?
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  2. November 14th 2012, 04:49 PM #2
    skeeter
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    Re: how to find equation?

    looks like a basic sine wave with amplitude of 175 and period of 50 ...

    V(x) = 175\sin\left(\frac{\pi x}{25}\right)

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  3. November 14th 2012, 04:58 PM #3
    ahmedb
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    Re: how to find equation?

    Quote Originally Posted by skeeter View Post
    looks like a basic sine wave with amplitude of 175 and period of 50 ...

    V(x) = 175\sin\left(\frac{\pi x}{25}\right)

    How did you get the period of pi/25??
    isn't the period 50?
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  4. November 14th 2012, 05:08 PM #4
    skeeter
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    Re: how to find equation?

    did you not read the first line in my post?

    looks like a basic sine wave with amplitude of 175 and period of 50 ...
    fyi, \frac{\pi}{25} is not the period ...

    I recommend you research the role of the value B in the equation y = A\sin(Bx).
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  5. November 14th 2012, 05:28 PM #5
    ahmedb
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    Re: how to find equation?

    Quote Originally Posted by skeeter View Post
    did you not read the first line in my post?



    fyi, \frac{\pi}{25} is not the period ...

    I recommend you research the role of the value B in the equation y = A\sin(Bx).
    nvm got it, lol, 2pi/50 is B, correct?
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  6. November 14th 2012, 05:31 PM #6
    skeeter
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    Re: how to find equation?

    Quote Originally Posted by ahmedb View Post
    nvm got it, lol, 2pi/50 is B, correct?
    that's what my post stated.
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  7. November 14th 2012, 05:31 PM #7
    ahmedb
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    Re: how to find equation?

    Quote Originally Posted by skeeter View Post
    that's what my post stated.
    yep, thanks alot!! any "like" or thanks button on this forum?
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  8. November 15th 2012, 06:51 AM #8
    ahmedb
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    Re: how to find equation?

    how can you convert it to cos?
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  9. November 15th 2012, 09:33 AM #9
    Aryth
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    Re: how to find equation?

    Pretty simply. sin(u) = cos\left(\frac{\pi}{2} - u\right)
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