Review Calculus

Lecture 4: Vectors in Polar Coordinates

http://ocw.mit.edu/resources/res-18-007-calculus-revisited-multivariable-calculus-fall-2011/part-ii/lecture-4-vectors-in-polar-coordinates/

Lecture 3: Multiple Integration and the Jacobian

http://ocw.mit.edu/resources/res-18-007-calculus-revisited-multivariable-calculus-fall-2011/part-v/lecture-3-multiple-integration-and-the-jacobian/