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f(x) = x³
- f(x+p) = -(x+p)³ = - x³ - 3x²p - 3xp² -p³
lim (p->0) - f(x+p) - f(x) / p
lim (p->0) (-x³ -3x² p - 3xp² - p³ - x³)/(p)
lim(p->0) p (-3x² -3xp - p²) / p
lim(p->0) - 3x² - 3xp - p²
p = 0
= - 3x²
2)
lim(h->0) - [{ f(x+h) - f(x) }/ h]
= - f'(x)