Trigonometry

Contents :

1 History

2 Overview

2.1 Extending the definitions

2.2 Mnemonics

2.3 Calculating trigonometric functions

3 Applications

4 Pythagorean identities

5 Angle transformation formulae

6 Common formulae

6.1 Law of sines

6.2 Law of cosines

6.3 Law of tangents

6.4 Euler's formula

7 See also

8 References

9 Bibliography