I need help with this problem.

Show that if and only if

Thanks in advance

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- Aug 22nd 2010, 06:53 PMakolmanDelta-Epsilon proof
I need help with this problem.

Show that if and only if

Thanks in advance - Aug 25th 2010, 03:31 AMfaceniansufficient condition
Suppose that then , let r=x-c then

, ie,

I hope you can solve the necessary part now.