Additional online resources

Trigonometric substition.

http://www.math.hmc.edu/calculus/tutorials/trig_substitution/

http://math.furman.edu/~dcs/book/c6pdf/sec66.pdf

http://www.intmath.com/Methods-integration/8_Integration-trigonometric-substitution.php

Partial Fractions

http://archives.math.utk.edu/visual.calculus/4/partial_fractions.2/int6.html

http://www.math.ucdavis.edu/~kouba/CalcTwoDIRECTORY/partialfracdirectory/PartialFrac.html

http://tutorial.math.lamar.edu/Classes/CalcII/PartialFractions.aspx

http://math.ucsd.edu/~wgarner/math10b/partialfractions.htm