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Math Help - Finding the equation of trig function

  1. #1
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    Finding the equation of trig function

    A trig function has the form y= acos^(2)x + bcosx - 1.
    If x equals pi/3, pi, 5pi/3, find the values of a and b and show all calculations.

    Ok, my equation is like this

    y=cos^2x+0.5cosx-0.5

    Is it right? Could someone just verify if I have it right or wrong and why? thanks
    Last edited by skeske1234; May 9th 2009 at 10:34 AM.
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  2. #2
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    ...

    we need more information than what you're giving us. If you just give us the x-values, then y is variable, which means a and b vary as well
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