From 5e5c0ac2c3f80f14428c19293773245a8477aaaf Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Sun, 13 Aug 2017 13:32:18 -0400
Subject: math: Add cotangent function.

* chickadee/math.scm (cotan): New procedure.
---
 doc/api.texi | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'doc')

diff --git a/doc/api.texi b/doc/api.texi
index f5a2400..32a797b 100644
--- a/doc/api.texi
+++ b/doc/api.texi
@@ -429,6 +429,10 @@ approximation that is ``good enough.''
 Half of @var{pi}.
 @end defvar
 
+@deffn {Procedure} cotan @var{z}
+Return the cotangent of @var{z}.
+@end deffn
+
 @node Vectors
 @subsection Vectors
 
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