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Math Help - Sin A and Cos A

  1. #1
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    Sin A and Cos A

    Find the exact values of sin A and cos A. Write fractions in lowest terms.



    That is the problem. Is anyone able to explain to me how I find the answer? This trig stuff is really confusing me. You guys have been so helpful to me. Thank you so much.
    Last edited by DreadfulGlory; September 29th 2012 at 09:05 PM.
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: Sin A and Cos A

    \sin A=\frac{\text{opposite}}{\text{hypotenuse}}=\frac{  20}{25}=\frac{4}{5}

    \cos A=\frac{\text{adjacent}}{\text{hypotenuse}}=\frac{  15}{25}=\frac{3}{5}
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