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Let f be a differentiable function such that f '(x) = 7 – 4 3 x ) x ( f , (x > 0) and f

1. ≠ 4. Then ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + → x 1 xf lim 0 x
2. does not exist
3. exists and equals 7 4
4. exists and equals 4 (4) exists and equals 0

Correct answer: exists and equals 7 4

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