Math trig formulas Flashcards
1
Q
pythagorean idenity with csc
A
1=csc^2x - cot^2x
2
Q
pythagorean identity with sec
A
1+ tan ^2x= sec^2x
3
Q
cos(a+b)=
A
cos(a)cos(b)-sin(a)sin(b)
4
Q
cos(a-b)=
A
cos(a)cos(b)+sin(a)sin(b)
5
Q
sin(a+b)=
A
sin(a)cos(b)+sin(b)cos(a)
6
Q
sin(a-b)=
A
sin(a)cos(b)-sin(b)cos(a)
7
Q
tan(a+b)
A
(tan(a)+tan(b))/(1-tan(a)tan(b))
8
Q
tan(a-b)
A
(tan(a)-tan(b))/(1+tan(a)tan(b))
9
Q
sin(2a)
A
2sinacosa
10
Q
cos(2a) {in terms of sin)
A
1-2sin^2a
11
Q
cos(2a) {in terms of cos)
A
-1+2cos^2a
12
Q
cos(2a) {in terms of sin and cos)
A
cos^2a-sin^2a
13
Q
tan(2a)
A
(2tana)/(1-tan^2a)
