Trig Cofunction Identities
For real number or angle measured in radians, θ, the following cofunction identities exist:
Other Trigonometric Identities:
- Introduction to Trig Functions
- Domain, Range, and Period of Trig Functions
- Graphs of Trigonometric Functions
- Radians & Degrees
- Trig Even-Odd Identities
- Trig Reciprocal Identities
- Trig Cofunction Identities
- Trig Double-Angle Identities
- Trig Half-Angle Identities
- Trig Pythagorean Identities
- Trig Sum to Product Identities
- Trig Product to Sum Identities
- Trig Sum & Difference Identities
- Oblique Triangles: Law of Cosines
- Oblique Triangles: Law of Sines
- Polar Coordinate System
- Polar Equations & Graphs
- De Moivre's Theorem
