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Example:Finding Unknowns using Trigonometric Ratios

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Explanation:

Trigonometry (from Greek trigōnon "triangle" + metron "measure"[1]) 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