Logarithmic differentiation (Take ln of both sides: ln y = g(x)·ln f(x), then differentiate)
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Take ln of both sides: ln y = g(x)·ln f(x), then differentiate implicitly to get (1/y)(dy/dx)
What each symbol means
| Symbol | What it stands for |
|---|---|
| f(x) | Base function (must be positive) |
| g(x) | Exponent function |
When to use this
f(x) > 0 in the domain. Used when both base and exponent depend on x.