to learn more about trigonometric function from the introduction online, i recommended this site

http://www.ping.be/

this site have enough resources about trigonometric function like :

- Definitions and basics
- Trigonometric circle and angles
- Trigonometric numbers of a real number t
- Basic formulas

- Trigonometric functions
- The sine function
- The cosine function
- The tangent function
- The cotangent function

- Sum formulas like
- cos(u - v)
- cos(u + v)
- sin(u - v)
- sin(u + v)
- tan(u + v)
- tan(u - v)

pdf version of trigonometric relation you can download at link below, altough is not complete list like online version from ping.be

http://www.koeri.boun.edu.tr

and trygonometric function for calculus identities you can download at link below

http://www.nd.edu/~jharper1/TrigIdentities.pdf

the complete explanation and tutorial about trigonometric identities you can download tutorial that written by Thomas E. Price, from Department of Theoretical and Applied Mathematics, THE UNIVERSITY OF AKRON.

TRIGONOMETRIC IDENTITIES

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