1.

Let f(x) be twice differentiable on [1, 3], and let f(1)=f(3). Further if |f''(x)| le 2, then for all x in [1, 3] :

Answer»

`-1 le F'(x) le 1`
`-4 lt f'(x) lt 4`
`|f'(x)| GT 2`
`|f'(x)| lt 4`

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