| cotangent |
|
| The trig function cotangent,
written cot θ. cot θ equals  or
 . For
acute angles, cot θ can be found by the
SOHCAHTOA definition, shown below on the left.
The circle definition, a generalization of SOHCAHTOA,
is shown below on the right. f(x)
= cot x is a periodic function with
period π.
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