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Limits
lim[x→a] f(x) = L
left = right → limit exists
Derivative Rules
Power: d/dx[xⁿ] = nxⁿ⁻¹
Product: (fg)' = f'g + fg'
Chain: (f∘g)' = f'(g)·g'
Applications
f'(c) = 0 → critical point
f'' > 0 → concave up
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