Trig Identities Flashcards
1
Q
REC sinθ =
A
1/cscθ
2
Q
REC cscθ =
A
1/sinθ
3
Q
REC sinθcscθ =
A
1
4
Q
REC cosθ =
A
1/secθ
5
Q
REC secθ =
A
1/cosθ
6
Q
REC cosθsecθ =
A
1
7
Q
REC tanθ =
A
1/cotθ
8
Q
REC cotθ =
A
1/tanθ
9
Q
REC tanθcotθ =
A
1
10
Q
QUO tanθ =
A
sinθ/cosθ
11
Q
QUO cotθ =
A
cosθ/sinθ
12
Q
PYTH sin^2 θ + cos^2 θ =
A
1
13
Q
PYTH 1 + tan^2 θ =
A
sec^2θ
14
Q
PYTH 1 + cot^2 θ =
A
csc^2θ
15
Q
PYTH sec^2 θ - tan^2 θ =
A
1
16
Q
PYTH csc^2 θ - cot^2 θ =
A
1
17
Q
a^2 - b^2 =
A
(a+b)(a-b)
18
Q
sin(A+B) =
A
sinAcosB+cosAsinB
19
Q
sin(A-b) =
A
sinAcosB-cosAsinB
20
Q
cos(A+B) =
A
cosAcosB-sinAsinB
21
Q
cos(A-B) =
A
cosAcosB+sinAsinB
22
Q
tan(A+B) =
A
(tanA+cosB)/(1-tanAtanB)
23
Q
tan(A-B) =
A
(tanA-cosB)/(1+tanAtanB)
24
Q
sin2A =
A
2sinAcosA
25
1.) cos2A =
cos^2A-sin^2A
26
2.) cos2A =
1-sin^2A
27
3.) cos2A =
2cos^2A-1
28
tan2A =
2tanx/(1-tan^2x)
