MAT 1235 Calculus II 4.1, 4.2 Part I The Definite Integral
Homework WebAssign HW 4.2 I
Major Themes in Calculus I
We do not like to use the definition Develop techniques to deal with different functions
Major Themes in Calculus II
We do not like to use the definition Develop techniques to deal with different functions
Preview
Example 0
Use left hand end points to get an estimation
Example 0 Use right hand end points to get an estimation
Example 0 Observation: What happen to the estimation if we increase the number of subintervals?
In General i th subinterval sample point
In General
i th subinterval sample point
In General Sum of the area of the rectangles is Riemann Sum
In General Sum of the area of the rectangles is Sigma Notation for summation
In General Sum of the area of the rectangles is Index Initial value (lower limit) Final value (upper limit)
In General Sum of the area of the rectangles is
Definition
upper limit lower limit integrand
Definition Integration : Process of computing integrals
Example 1 Express the limit as a definite integral on the given interval.
Example 1 Express the limit as a definite integral on the given interval.
Remarks We are not going to use this limit definition to compute definite integrals. In section 4.3, we are going to use antiderivative (indefinite integral) to compute definite integrals. We will use this limit definition to derive important properties for definite integrals.
More Remarks
Example 2
Example 3 Compute by interpreting it in terms of area
Example 4 Compute
Properties The follow properties are labeled according to the textbook.
Property (a)
Example 5
Property (b) The definition of definite integral is well- defined even if upper limit < lower limit And
Property (b) The definition of definite integral is well- defined even if upper limit < lower limit And
Example 6 Note: If lower limit > upper limit, the integral has no obvious geometric meaning
Example 7 If, what is ?
Example 7 If, what is ? Q1: What is the answer? Q2: How many steps are needed to clearly demonstrate the solutions?
Property (c)
Example 8
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