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Math Help - true/false

  1. #1
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    Exclamation true/false

    If f(x) is defined for all x, then f'(x) is defined for all x
    why/why not?
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  2. #2
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    Quote Originally Posted by puravida12 View Post
    If f(x) is defined for all x, then f'(x) is defined for all x
    why/why not?

    Check f(x):=|x| at x = 0.[\math]

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