From 1365893b87a56b51fabb3403522bc2ac5d8b664e Mon Sep 17 00:00:00 2001
From: Alex Jordan <alex.jordan@pcc.edu>
Date: Wed, 27 Nov 2024 15:50:19 -0800
Subject: [PATCH] make specialAngle return 0 when it would otherwise return 0pi

---
 macros/math/specialTrigValues.pl | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/macros/math/specialTrigValues.pl b/macros/math/specialTrigValues.pl
index c63e2a27d0..79f9f19390 100644
--- a/macros/math/specialTrigValues.pl
+++ b/macros/math/specialTrigValues.pl
@@ -17,7 +17,8 @@ =head2 Description
 
 C<specialAngle(x)> returns a MathObject Formula in Numeric context of the form
 "a pi/c" that is the closest possible to x, where a is an integer, and c is from
-a specified set of positive integers. By default, c comes from [1,2,3,4,6].
+a specified set of positive integers. By default, c comes from [1,2,3,4,6]. If
+a equals 0, then this returns Formula('0').
 
 =head2 Options
 
@@ -106,7 +107,7 @@ sub specialAngle {
 	} else {
 		$a = $closest->[0];
 	}
-	my $return = Formula("$a pi $divc");
+	my $return = ($a ne '0') ? Formula("$a pi $divc") : Formula('0');
 	Context($mycontext);
 	return $return;
 }