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5.3 Definite Integrals and Antiderivatives Greg Kelly, Hanford High School, Richland, Washington
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Page 269 gives rules for working with integrals, the most important of which are: 1. If the upper and lower limits are equal, then the integral is zero. 2. Reversing the limits changes the sign. 3. Constant multiples can be moved outside.
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1. If the upper and lower limits are equal, then the integral is zero. 2. Reversing the limits changes the sign. 3. Constant multiples can be moved outside. 5-6. Integrals can be added and subtracted.
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5-6. Integrals can be added and subtracted. 10. Intervals can be added (or subtracted.)
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The average value of a function is the value that would give the same area if the function was a constant:
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The mean value theorem for definite integrals says that for a continuous function, at some point on the interval the actual value will equal the average value. Average value of a function If f is continuous on then at some point c in,
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The math professor's six-year-old son knocks at the door of his father's study. "Daddy", he says. "I need help with a math problem I couldn't do at school." "Sure", the father says and smiles. "Just tell me what's bothering you." "Well, it's a really hard problem: There are four ducks swimming in a pond, when two more ducks come and join them. How many ducks are now swimming in the pond?" The professor stares at his son with disbelief: "You couldn't do that?! All you need to know is that 4 + 2 = 6!" "Do you think, I'm stupid?! Of course, I know that 4 + 2 = 6. But what does this have to do with ducks!?"
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