1
Q
sine rule
A
a/sinA = b/sinB = c/sinC
2
Q
cosine rule for angles
A
cosA = (b^2+c^2-a^2)/2bc
3
Q
cosine rule for lengths
A
a^2 = b^2 + c^2 -2bccosA
4
Q
area of a triangle
A
1/2 x a x b x sinC
5
Q
what is sin^2x
A
1-cos^2x
6
Q
what is 1+cot^2x
A
cosec^2x
7
Q
what is 1+tan^2x
A
sec^2x
