Essential Derivative Rules
- Power Rule: d/dx [xⁿ] = n · xⁿ⁻¹
- Product Rule: d/dx [u · v] = u'v + uv'
- Quotient Rule: d/dx [u / v] = (u'v − uv') / v²
- Chain Rule: d/dx [f(g(x))] = f'(g(x)) · g'(x)
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