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Math Help - Finding an Expression

  1. #1
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    Finding an Expression

    I have no idea how to do this question..
    Please Simplify:

    cos^2(cos^(-1)(6/x))


    Please see the attached for info

    Thanks!
    Attached Thumbnails Attached Thumbnails Finding an Expression-untitled.jpg  
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  2. #2
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    Quote Originally Posted by gearshifter View Post
    I have no idea how to do this question..
    Please Simplify:

    cos^2(cos^(-1)(6/x))


    Please see the attached for info

    Thanks!
    Read this thread for a way of doing questions like this: http://www.mathhelpforum.com/math-he...xpression.html
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  3. #3
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    Quote Originally Posted by gearshifter View Post
    I have no idea how to do this question..
    Please Simplify:

    cos^2(cos^(-1)(6/x))


    Please see the attached for info

    Thanks!
    That is the same as \left(cos(cos^{-1}(6/x))\right)^2. IMPORTANT: the "-1" on the cos mean "inverse function" not reciprocal! You should know that f(f^{-1})(x)= x.
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