SIN RULE (2 angles and 1 side)
a/SINA = b/SINB = c/SINC
COSINE RULE ( 3 sides or an angle between two sides)
a^2= b^2 + c^2 - 2bcCosA
AREA OF A TRIANGLE
A= 1/2 abSinC
PROOFS OF TRIG FUNCTIONS
Tan(x) = Sin(x)/Cos(x)
(Sin(x))^2 + (Cos(x))^2 =1
proofs come up a lot in exams so you will need to know these. you may be given some formula and have to manipulate it in order to get it to look like either of these.
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