Exact Values of Trigonometric Functions
Pronunciation: /ɪgˈzækt ˈvæl yuz ʌv ˌtrɪg əˈnɒm ɪ trik ˈfʌŋk ʃənz/ ?
The exact values of trigonometric functions
are values of trigonometric functions of certain
angles
that can be expressed
exactly
using
expressions
containing
real numbers
and roots of real numbers.^{[1]} These values are
also called analytic values of trigonometric functions or
trigonometric values of special angles. These angles
are often used on tests where a calculator is not allowed, so it is useful for
students to memorize these angles and the values of trigonometric functions
of these angles. A mnemonic for remembering these values is at the end of this
article.
A mnemonic for remembering the values of sine for special angles is:

Figure 1: Mnemonic for sine of special angles 
A mnemonic for the cosine values of special angles is similar:

Figure 1: Mnemonic for cosine of special angles 
Cite this article as:
Exact Values of Trigonometric Functions. 20100201. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/e/exactvaltrig.html.
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Revision History
20100201: Added "References" (
McAdams, David.)
20091226: Combined with Analytic Values of Trigonometric Functions and added reference (
McAdams, David.)
20090107: Initial version (
McAdams, David.)