History of Trigonometric function

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	Revision 17 . . (edit) September 1, 2001 8:07 am by AxelBoldt
	Revision 16 . . September 1, 2001 12:57 am by AxelBoldt [link to angle; clean up first paragraph]
	Revision 15 . . (edit) August 28, 2001 11:10 pm by Zundark [add link]
	Revision 14 . . August 23, 2001 4:19 am by (logged).7.146.xxx
	Revision 13 . . (edit) August 20, 2001 4:07 pm by Zundark [remove self-link]
	Revision 12 . . (edit) August 20, 2001 8:01 am by (logged).176.164.xxx *[formatting fix]**
	Revision 11 . . August 20, 2001 8:00 am by (logged).176.164.xxx *[refined Unit Circle definition]**
	Revision 10 . . August 18, 2001 1:37 pm by (logged).176.164.xxx *[Added the unit circle to define the functions for angles that triangles cannot]**
	Revision 9 . . August 18, 2001 4:11 am by AxelBoldt

Difference (from prior major revision) (minor diff)

Changed: 3,5c3

A trigonometric function is a function of an angle defined by a ratio of two sides of a right triangle that contains that angle. See also Trigonometric Function/Trigonometric Identities

Although this definition implies that the Trigonometric Functions are defined only for angles of less than 90 degrees, they are defined on all angles whose measure is a real number.

A trigonometric function is a function of an angle important when studying triangles. They may be defined as ratios of two sides of a right triangle containing the angle, or, more generally, as ratios of coordinates of points on the unit circle. Both approaches will be presented below.

Changed: 9,14c7,12

* Sine
* Cosine
* Tangent
* Secant
* Cosecant
* Cotangent

* Sine (sin)
* Cosine (cos)
* Tangent (tan)
* Secant (sec)
* Cosecant (csc)
* Cotangent (cot)

Added: 15a14,17

Several relations between these functions are listed on the page about Trigonometric Identities.