# Difference between revisions of "Trigonometric functions"

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The well known trigonometric functions can be visualized on the circle of radius 1. See http://en.wikipedia.org/wiki/Trigonometric_functions for the definitions.

• Tangent: $\tan x = \frac{\sin x}{\cos x}$
• Secant $\sec x = \frac{1}{\cos x}$