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## Main Question or Discussion Point

The professor said he didnt know the ans of this qn, so, can u help?

Question: Can you have lim_x->a f '(x) = D , f ' (a) exists, but not equal to D?

any one can give an example? thx!

Question: Can you have lim_x->a f '(x) = D , f ' (a) exists, but not equal to D?

any one can give an example? thx!