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http://www.mathhelpforum.com/math-help/vlatex/pics/105_fde5ac6b051b4fac473487c7b4afa9e5.png [Broken]

Is f(x) differentiable at x=1?

I know that we have to prove

http://www.mathhelpforum.com/math-help/vlatex/pics/65_6fae3c52eaa96aaafdf2c225a900ea48.png [Broken]

exist/does not exist at x=1. But how do I begin? It's a piece-wise function.

Thanks for your help.

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# Homework Help: Is f(x) differentiable at x=1?

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