This is an incomplete list. I'm trying to add to it as I go.

everything with the #remember tag as well as the representations of the various DE, they start with #de_

Also remember the following:
## derivatives of trigs
$\frac{d}{dx}\tan(x)=sec^2(x)$
$\frac{d}{dx}sec(x)=sec(x)\tan(x)$
...
## integrals of trigs
$\int \tan(x) \, dx=\ln\mid \sec(x)\mid+C$
$\int sec(x) \, dx=\ln\mid sec(x)+\tan(x)\mid+C$
...
## integration by parts
LIATE -> log, inv trig, algebraic, trig, exp
set u to the first in the list above
$\int u(x)v'(x) \, dx=uv-\int u'(x)v(x) \, dx$