Derivative of Constant to Power of Function
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Theorem
Let $u$ be a differentiable real function of $x$.
Let $a \in \R_{>0}$.
Let $a^u$ be $a$ raised to the power of $u$.
Then:
- $\map {\dfrac \d {\d x} } {a^u} = a^u \ln a \dfrac {\d u} {\d x}$
Proof
\(\ds \map {\frac \d {\d x} } {a^u}\) | \(=\) | \(\ds \map {\frac \d {\d u} } {a^u} \frac {\d u} {\d x}\) | Chain Rule for Derivatives | |||||||||||
\(\ds \) | \(=\) | \(\ds a^u \ln a \frac {\d u} {\d x}\) | Derivative of Power of Constant |
$\blacksquare$
Sources
- 1968: Murray R. Spiegel: Mathematical Handbook of Formulas and Tables ... (previous) ... (next): $\S 13$: Derivatives of Exponential and Logarithmic Functions: $13.28$
- 1974: Murray R. Spiegel: Theory and Problems of Advanced Calculus (SI ed.) ... (previous) ... (next): Chapter $4$. Derivatives: Derivatives of Special Functions: $11$