Trig Identities Flashcards
1
Q
tan θ
Quotient Identity
A
sin θ / cos θ
2
Q
cot θ
Quotient Identity
A
cos θ / sin θ
3
Q
sec θ
Reciprocal Identity
A
1/cos θ
4
Q
csc θ
Reciprocal Identity
A
1/sin θ
5
Q
tan θ cot θ
A
1
6
Q
sin^2 θ + cos^2 θ
Pythagorean Identity
A
1
7
Q
sec^2 θ - tan^2 θ
Pythagorean Identity
A
1
8
Q
csc^2 θ - cot^2 θ
Pythagorean Identity
A
1
9
Q
1 + tan^2 θ
Pythagorean Identity
A
1/cos^2 θ or sec^2 θ
10
Q
1 + cot^2 θ
Pythagorean Identity
A
1/sin^2 θ or csc^2 θ
11
Q
cot θ
Reciprocal Identity
A
1/tan θ
12
Q
cos (𝜋/2 - θ)
Co-function Identity
A
sin θ
13
Q
sin (𝜋/2 - θ)
Co-function Identity
A
cos θ
14
Q
cot (𝜋/2 - θ)
Co-function Identity
A
tan θ
15
Q
tan (𝜋/2 - θ)
Co-function Identity
A
cot θ
24
Q
sin (θ/2)
Half-Angle Formula
A
25
Q
cos (θ/2)
Half-Angle Formula
A
26
Q
tan (θ/2)
Half-Angle Formula
A
28
Q
tan (θ/2)
Half-Angle Formula
A
