Just discovered Cramster. Awesome. If they have coverage for the text used in your class, this is super helpful.
Finding that Wolfram Alpha is also becoming more useful. Easier to run to it to figure out the integral of x^2 sinx sinhx than spinning up mathematica or maple or matlab.
[...] Online math resources -Via The Ludwigs – Finding that Wolfram Alpha is also becoming more useful. Easier to run to it to figure out the integral of x^2 sinx sinhx than spinning up mathematica or maple or matlab. [...]