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Math Help - Prove that f(x) is continuous.

  1. #1
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    Post Prove that f(x) is continuous.

    1: show that

    f(x) = |x-1| + cos (x) = 3

    is continious when x belongs to R.


    2:

    Detirmine if the derived to the function

    f(x) = { x+ x(x-1)* sin( (1/(1-infinite ) ) if x != 1
    { 1 if x = 1

    exists in the point x=1 and find f'(1)
    Last edited by mr fantastic; October 3rd 2011 at 02:12 PM. Reason: Re-titled.
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  2. #2
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    Re: Prove that f(x) is continious

    Quote Originally Posted by testname12345 View Post
    Bump. Really need help :/
    Your #1 contains an error: the = should be + ?
    Tell us what you do not understand about that question.
    What have you tried?
    Last edited by mr fantastic; October 3rd 2011 at 02:11 PM.
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