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Let f : R → R be a differentiable function satisfying f '

1. + f '
2. = 0. Then x 1 0 x ) 2 ( f ) x 2 ( f 1 ) 3 ( f ) x 3 ( f 1 lim ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − − + − + + → is qual to -
3. 1
4. e –1 (3) e (4) e 2

Correct answer: + f '

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