Trigonometry (from Greek words "trigōnon" and "metron") is a branch of mathematics that explores trigonometric functions and their applications in geometry, such as relationships between the sides and angles of triangles. Trigonometry originated from the geometric applications of the 3rd century BCE (Hellenistic period), particularly in astronomy.
- Trigonometric Functions
- Trigonometric Identities
- Sum and Difference Formulas
- Double Angle Formulas
- Half-Angle Formulas
- Trigonometric Functions of Negative Angles
- Values of Trigonometric Functions
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