Tangent
tangent
tan
The trig function tangent,
written tan θ. tan θ equals 
.
For acute angles, tan θ can
be found by the SOHCAHTOA definition
as shown below on the left. The circle
definition, a generalization
of SOHCAHTOA, is shown
below on the right. f(x) = tan x is
a periodic function with period π.
See also