18.01SC | Fall 2010 | Undergraduate

Single Variable Calculus

3. The Definite Integral and its Applications

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Introduction

The derivative tells us the rate of change of a function whose values we know. The definite integral tells us the value of a function whose rate of change and initial conditions are known.

Part A: Definition of the Definite Integral and First Fundamental Theorem

Part B: Second Fundamental Theorem, Areas, Volumes

Part C: Average Value, Probability and Numerical Integration

Exam 3

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The definite integral of a function describes the area between the graph of that function and the horizontal axis. The First Fundamental Theorem of Calculus confirms that we can use what we learned about derivatives to quickly calculate this area.

» Session 43: Definite Integrals
» Session 44: Adding Areas of Rectangles
» Session 45: Some Easy Integrals
» Session 46: Riemann Sums
» Session 47: Introduction of the Fundamental Theorem of Calculus
» Session 48: The Fundamental Theorem of Calculus
» Session 49: Applications of the Fundamental Theorem of Calculus
» Session 50: Combining the Fundamental Theorem and the Mean Value Theorem
» Problem Set 6

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The Second Fundamental Theorem of Calculus describes how integration is the opposite of differentiation. It allows us to understand functions defined in terms of definite integrals, some of which are impossible to describe using more elementary methods. This part of the course also covers the use of integration to calculate volumes of solids.

» Session 51: The Second Fundamental Theorem of Calculus
» Session 52: Proving the Fundamental Theorem of Calculus
» Session 53: New Functions From Old
» Session 54: The Second Fundamental Theorem and ln(x)
» Session 55: Creating New Functions Using the Second Fundamental Theorem
» Session 56: Geometric Interpretation of Definite Integrals
» Session 57: How to Calculate Volumes
» Session 58: Volume of a Sphere, Revolving About x-axis
» Session 59: Volume of a Parabaloid, Revolving About y-axis
» Problem Set 7

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Calculating averages and probabilities is an important application of integration. Although we can differentiate almost any function we can describe, there are functions whose integral we cannot directly describe; this part of the course describes numerical methods used to calculate the values of such integrals.

» Session 60: Integrals and Averages
» Session 61: Integrals and Weighted Averages
» Session 62: Integrals and Probability
» Session 63: Numerical Integration
» Session 64: Numerical Integration, Continued
» Session 65: Bell Curve, Conclusion
» Problem Set 8

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