# Stokes' theorem proof part 6 | Multivariable Calculus | Khan Academy | Summary and Q&A

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June 23, 2012
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Stokes' theorem proof part 6 | Multivariable Calculus | Khan Academy

## TL;DR

This video explores the algebraic manipulation of line integrals and the application of Green's theorem to convert them into double integrals over a region.

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### Q: How can line integrals be manipulated algebraically?

Line integrals can be manipulated by grouping and factoring terms that are being multiplied by dx dt and dy dt. This helps simplify the expression and prepare it for the application of Green's theorem.

### Q: What is the significance of the template resembling Green's theorem in the manipulated expression?

The resemblance to Green's theorem allows us to rewrite the expression in terms of M dx and N dy, which makes it easier to apply the theorem. It also suggests that the concept of a surface integral is applicable.

### Q: What does the application of Green's theorem to the manipulated expression achieve?

Applying Green's theorem allows us to convert the line integral into a double integral over a region. This provides a way to evaluate the integral in terms of the region's properties rather than the curve itself.

### Q: How does the result obtained through Green's theorem compare to earlier evaluations?

The result obtained through Green's theorem is the same as earlier evaluations when the line integral was directly evaluated over the surface. This demonstrates the equivalence of the two approaches.

## Summary & Key Takeaways

• The video discusses the algebraic manipulation of line integrals and how to group and distribute terms to simplify the expression.

• The expression starts resembling a template similar to Green's theorem, which involves functions of x and y multiplied by dx dt and dy dt.

• By applying Green's theorem to the manipulated expression, it can be converted into a double integral over a region, providing the same result as earlier evaluations.