Trigonometry
Sine, cosine, tangent, the unit circle, inverse trig functions, identities, and applications.
Graphing Trigonometric Functions13
Amplitude, period, phase shift, sinusoids, and graphing trig functions
Inverse Trigonometric Functions8
Arcsine, arccosine, arctangent, and inverse trig function properties
Trig Functions & Definitions30
Sine, cosine, tangent, unit circle, SOHCAHTOA, law of sines/cosines, and basic trig definitions
Trigonometric Identities14
Pythagorean, double angle, half angle, sum/difference, and other trig identities
All Trigonometry Terms A–Z (57)
- Amplitude
- Bearing
- Circle Trig Definitions
- Clockwise
- Cofunction Identities
- Cosecant
- Cosine
- Cotangent
- Coterminal Angles
- Counterclockwise
- Double Angle Identities
- Frequency of a Periodic Function
- Frequency of Periodic Motion
- Half Angle Identities
- Initial Side of an Angle
- Inverse Cosecant
- Inverse Cosine
- Inverse Cotangent
- Inverse Secant
- Inverse Sine
- Inverse Tangent
- Inverse Trig Functions
- Inverse Trigonometry
- Law of Cosines
- Law of Sines
- Model
- Odd/Even Identities
- Period of a Periodic Function
- Period of Periodic Motion
- Periodic Function
- Periodic Motion
- Periodicity Identities
- Phase Shift
- Product to Sum Identities
- Quadrantal Angle
- Ratio Identities
- Reciprocal Identities
- Reference Angle
- RPM
- Secant
- Simple Harmonic Motion
- Sine
- Sinusoid
- SOHCAHTOA
- Special Angles
- Spherical Trigonometry
- Sum to Product Identities
- Sum/Difference Identities
- Tangent
- Terminal Side of an Angle
- Trig Functions
- Trig Identities
- Trig Values of Special Angles
- Trigonometry
- Unit Circle
- Unit Circle Trig Definitions
- Wavelength
Frequently Asked Questions
What is trigonometry?
Trigonometry is the branch of mathematics that studies relationships between side lengths and angles of triangles. The three primary trigonometric functions — sine, cosine, and tangent — relate angles to ratios of sides in right triangles.
What is SOHCAHTOA?
SOHCAHTOA is a mnemonic for remembering the three basic trig ratios: Sine = Opposite/Hypotenuse, Cosine = Adjacent/Hypotenuse, Tangent = Opposite/Adjacent.
Why is the unit circle important?
The unit circle extends trigonometric functions beyond right triangles to all real numbers. It shows how sine and cosine values repeat every 2π radians (360°) and provides exact values for common angles like 30°, 45°, and 60°.