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It is the process of determining the differences of elevation of stations from observed vertical angle and known horizontal distance..
There are three types of trigonometric functions, they are:
1- Plane Trigonometric Functions
2- Inverse Trigonometric Functions and
3- Hyperbolic Trigonometric Functions
Use the trigonometric relations and identities.
The sine and cosine are both trigonometric functions.
Trigonometric calculations are used in many branches of engineering.
TRIGONOMETRIC FUNCTIONS OF ANY ANGLE