There are six functions of an angle commonly used in trigonometry. Their names and abbreviations are sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc).

Spherical trigonometry is the study of triangles on the surface of a sphere whereas plane trignometry is the study of triangles on the surface of a plane. These are important in surveying, navigation, and astronomy.

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