8.2 Trigonometric Ratios of Some Specific Angles
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No.
1(iv)
Example:Simplify Trigonometric Expression
Explanation:
Trigonometry (from Greek trigōnon "triangle"
+ metron "measure") is a branch of mathematics that
studies triangles and the relationships between their sides and the angles between
these sides. Trigonometry defines the trigonometric
functions, which describe those relationships and have applicability to
cyclical phenomena, such as waves. It
has applications in both pure mathematics and applied
mathematics, where it is essential in many branches of science and technology.
http://en.wikipedia.org/wiki/Trigonometry
Special values in trigonometric functions (Our solved example in
mathguru.com uses this concept).
There are some commonly used special values in trigonometric
functions, as shown in the following table.
Function








sin

0






1

cos

1






0

tan

0



1




cot




1



0

sec

1




2



csc



2




1

http://en.wikipedia.org/wiki/Trigonometric_functions
The
above explanation is copied from Wikipedia, the free encyclopedia and is
remixed as allowed under the Creative Commons Attribution ShareAlike 3.0 Unported
License.