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MTH 252 Integral Calculus Chapter 6 – Integration Section 6.6 – The Fundamental Theorem of Calculus Copyright © 2005 by Ron Wallace, all rights reserved.
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Indefinite vs. Definite Integrals is the set of functions of the form F(x) + c where F’(x) = f(x) is the number How are these two entities related?
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Reminder: The Mean-Value Theorem If f(x) is differentiable over (a,b), then there is a c (a,b) where OR
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Reminder: The Mean-Value Theorem If F(x) is differentiable over (x k-1,x k ), then there is a x k * (x k-1,x k ) where OR
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Reminder: Riemann Sum MVT: If F’(x) = f(x) … … Adding these up gives …
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Reminder: Definite Integral If f(x) is continuous [a,b] and F’(x) = f(x) …
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Fundamental Theorem of Calculus If f(x) is continuous [a,b] and F’(x) = f(x) … (Part I) Note that this works with ANY antiderivative. Why?
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Integrating a Piecewise Function
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Integrating an Absolute Value Function
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Mean Value Theorem for Integrals Let f(x) be continuous over [a,b]. Extreme-Value Theorem m & M where m ≤ f(x) ≤ M Therefore … Or …
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Mean Value Theorem for Integrals Therefore … Intermediate-Value Theorem f(x) takes on all values between m & M. Remember: m f(x) M Therefore, there exists x * [a,b] where …
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Mean Value Theorem for Integrals If f(x) is continuous over [a,b], then there exists x * [a,b] where … OR The number f(x * ) is called the average value of the function. abx*x* f(x * )
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The Area Function A(x)
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The Derivative of the Area Function MVT for Integrals
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Fundamental Theorem of Calculus (Part II) If f(t) is continuous over an interval containing a, then
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FTC Part II: Examples Check these out by integrating and then differentiating! NOTE: Chain Rule!
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