Trigonometric Formulas
Right-Triangle Definition:
Reciprocal Identities:
Ratio Identities:
Tangent and Cotangent Identities:
Pythagorean Identities:
Reciprocal Identities:
Half Angle Formulas:
Sum and Difference Formulas/Identities:
Double-angle formulas:
Inverse Trig Functions:
Sum to Product Formulas:
Degrees to Radians Formulas:
Cofunction Formulas:
Law of Sines, Cosines and Tangents:
How to Find Reference Angles:
Odd-Even Identities:
Facts and Properties
Period:
Domain:
Range:
Unit circle definition:
Unit Circle:
Trigonometric Functions of Common Angles: