https://imageshack.com/i/poSCQADHj
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https://imageshack.com/i/pm5niYvaj
| (4(x+h) + 4) − (4x +4) | 4h | |||
lim | = lim | = 4 | ||
| h | h |
| ( (x+h)2 + 4) − (x2 + 4) | x2 + 2hx + h2 + 4 − x2 − 4 | |||
lim | = lim | = | ||
| h | h |
| 2hx + h2 | ||
= lim | = lim (2x + h) = 2x | |
| h |