There are three types of trigonometric functions, they are: 1- Plane Trigonometric Functions 2- Inverse Trigonometric Functions and 3- Hyperbolic Trigonometric Functions
TRIGONOMETRIC FUNCTIONS OF ANY ANGLE
With ease, I suppose. The question depends on what you consider easy trigonometric functions.
There are several topics under the broad category of trigonometry. * Angle measurements * Properties of angles and circles * Basic trigonometric functions and their reciprocals and co-functions * Graphs of trigonometric functions * Trigonometric identities * Angle addition and subtraction formulas for trigonometric functions * Double and half angle formulas for trigonometric functions * Law of sines and law of cosines * Polar and polar imaginary coordinates.
You can use them to find the sides and angles of a right triangle... just like regular trigonometric functions
The sine and cosine are both trigonometric functions. Trigonometric calculations are used in many branches of engineering.
Trigonometric identities involve certain functions of one or more angles. These identities are useful whenever expressions involving trigonometric functions need to be simplified.
Hipparchus, Menelaus, Ptolomy