Fundamental Theorem of Calculus/First Part/Corollary
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Corollary to Fundamental Theorem of Calculus (First Part)
Let $f$ be a real function which is continuous on the closed interval $\closedint a b$.
Let $F$ be a real function which is defined on $\closedint a b$ by:
- $\ds \map F x = \int_a^x \map f t \rd t$
Then:
- $\ds \frac \d {\d x} \int_a^x \map f t \rd t = \map f x$
Proof
Follows from the Fundamental Theorem of Calculus (First Part) and the definition of primitive.
$\blacksquare$
Sources
- 2005: Roland E. Larson, Robert P. Hostetler and Bruce H. Edwards: Calculus (8th ed.): $\S 4.4$