You find the average rate of change of the function. That gives you the derivative on different points of the graph.
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There are three types of trigonometric functions, they are: 1- Plane Trigonometric Functions 2- Inverse Trigonometric Functions and 3- Hyperbolic Trigonometric Functions
Look on a unit circle graph and see what kind of pi it has. For example 90 degrees is pi/2
With ease, I suppose. The question depends on what you consider easy trigonometric functions.
Vectors.
Trigonometric identities involve certain functions of one or more angles. These identities are useful whenever expressions involving trigonometric functions need to be simplified.