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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