Trig Identities Flashcards
tan θ
Quotient Identity
sin θ / cos θ
cot θ
Quotient Identity
cos θ / sin θ
sec θ
Reciprocal Identity
1/cos θ
csc θ
Reciprocal Identity
1/sin θ
tan θ cot θ
1
sin^2 θ + cos^2 θ
Pythagorean Identity
1
sec^2 θ - tan^2 θ
Pythagorean Identity
1
csc^2 θ - cot^2 θ
Pythagorean Identity
1
1 + tan^2 θ
Pythagorean Identity
1/cos^2 θ or sec^2 θ
1 + cot^2 θ
Pythagorean Identity
1/sin^2 θ or csc^2 θ
cot θ
Reciprocal Identity
1/tan θ
cos (𝜋/2 - θ)
Co-function Identity
sin θ
sin (𝜋/2 - θ)
Co-function Identity
cos θ
cot (𝜋/2 - θ)
Co-function Identity
tan θ
tan (𝜋/2 - θ)
Co-function Identity
cot θ
csc (𝜋/2 - θ)
Co-function Identity
sec θ
sec (𝜋/2 - θ)
Co-function Identity
csc θ
sin (-θ)
Even-Odd Identity
- sin θ
cos (-θ)
Even-Odd Identity
cos θ
tan (-θ)
Even-Odd Identity
- tan θ
csc (-θ)
Even-Odd Identity
- csc θ
sec (-θ)
Even-Odd Identity
sec θ
cot (-θ)
Even-Odd Identity
- cot θ
sin (θ/2)
Half-Angle Formula
