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# Calculus II - 20

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Stewart Calculus Section 11.1

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### Calculus II - 20

1. 1. 11.1 Infinite SequencesA sequence is something like this: = , , ,··· + = +
2. 2. ( ) ( ) = =
3. 3. ( ) ( + ) ( ) ( + ) = =
4. 4. A sequence { } has the limit if for every > there is a corresponding integer such that for every > we have | |<We say { } is convergent, and write =or as
5. 5. What does it mean? =
6. 6. Properties:For convergent sequence { } and { } ( + )= + ( )= ( )= = ( )= · = if = ( )= if > , >
7. 7. Some useful theorems: If for and = = then = . If | |= then = . If ( )= and ( )= then = . If = and ( ) is continuous at then ( ) = ( ).
8. 8. Some useful examples: = if > = if = = if < < is divergent otherwise.
9. 9. Ex: Find +
10. 10. Ex: Find + = + +
11. 11. Ex: Find + = + + = +
12. 12. Ex: Find + = + + = + = = . +
13. 13. Ex: Find
14. 14. Ex: Find /Since = = (l’Hospital’s Rule)we have = .
15. 15. ( )Ex: Find
16. 16. ( )Ex: Find ( )Since = = ( )we have = .