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If f(x)=|x^2-5x+6|,t h e nf^(prime)(x)e ...

If `f(x)=|x^2-5x+6|,t h e nf^(prime)(x)e q u a l s` `2x-5for22` `5-2xforx<3`

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  10. Prove that lim(x->0) (f(x+h)+f(x-h)-2f(x))/h^2 = f''(x)

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