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Math Help - More Simplifying

  1. #1
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    More Simplifying

    Hi
    I need help on the following questions:
    Simplify the following expression in an exact form: cos(sin^{-1}\frac{4}{5})

    P.S
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  2. #2
    Super Member bigwave's Avatar
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    Cool exact form

    \cos\left(\sin^{-1}\left(\frac{4}{5}\right)\right) = \frac{3}{5}
    Last edited by bigwave; January 12th 2010 at 11:53 PM. Reason: more info
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  3. #3
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    can this be done without using the calculator??
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  4. #4
    Super Member bigwave's Avatar
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    you are looking at a 3,4,5 triangle
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  5. #5
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    ok ic
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