Trig Identities Flashcards
1
Q
Sin^2 (x) + Cos^2 (x) =
A
1
2
Q
Sec^2 (x)
A
Tan^2 (x) + 1
3
Q
Tan (x)
A
Sin (x) / Cos (x)
4
Q
Cot (x)
A
= Cos x/ Sin x
5
Q
Sec^2 (x) - tan^2 (x)
A
= 1
6
Q
Csc^2 (x) - cot^2 (x)
A
1
7
Q
Reciprocal: Sin (x)
A
1/ csc(x)
8
Q
Reciprocal: Cos (x)
A
1/ sec (x)
9
Q
Reciprocal tan (X)
A
1/cot(x)
10
Q
Reciprocal: csc(x)
A
1/sin(x)
11
Q
Reciprocal: sec (x)
A
1/cos(x)
12
Q
Reciprocal: Cot (x)
A
1/tan(x)
13
Q
E/O Iden : Sin(-x) =
A
-sin(x)
14
Q
E/O/Iden: tan(-x)
A
-tan (x)
15
Q
E/O/iden: csc(-x)
A
-csc(x)
16
Q
E/O/ iden: cos(-x) =
A
Cos (x)
17
Q
E/O/Iden: cot(-x) =
A
-cot (x)
18
Q
E/O/Iden: Sec(-x) =
A
Sec (x)
19
Q
Sin (2X)
A
2 Sin (x) Cos (x)
20
Q
Cos (2x)
A
Cos^2 (x) - Sin ^2 (x)
21
Q
Cos (2x)
A
2 Cos^2 (x) - 1
22
Q
Cos (2x)
A
1-2 sin^2 (x)
23
Q
Tan(2x)
A
( 2 tan (x)) / ( 1- tan^2 (x)
24
Q
Sin^2 (x) =
A
( 1-Cos(2x))/(1+cos (2x))
25
Q
Cos^2 (x)
A
( 1+ Cos (2x))/2
26
Q
Tan^2 (x)
A
(1- cos(2x))/(1+ cos( 2x))
