A level formula Flashcards
1
Q
Quadratic formula
A
-b+-(sqr root of b squared -4ac)/2a
2
Q
cosine rule
A
a squared= b squared + c squared - 2bc cos A
3
Q
Cosine rule for angle
A
Cos A= (b squared + c squared - a squared)/ 2bc
4
Q
Sine rule
A
a/Sin a= b/Sin B
5
Q
Area of triangle
A
1/2 a x b x sin C
6
Q
A line is perpendicular if:
A
m1 x m2= -1
7
Q
log x(1)=
A
0
8
Q
log x (1/y)=
A
-log x(y)
9
Q
unit vector=
A
^a_
10
Q
^a_=
A
1/magnitude of vector
11
Q
angle to positive x axis
A
cos anglex= x/ magnitude
12
Q
cosec squared=
A
1+ cot squared
13
Q
sec squared=
A
tan squared +1
14
Q
cos 2 theta=
A
cos squared - sin squared
15
Q
cos 2 theta=
A
2cos squared -1
