fix doctring in exptrig

mmatera · rocky · commit a0a15ef08cb3 · 2020-12-23T19:55:03.000-05:00
diff --git a/mathics/builtin/exptrig.py b/mathics/builtin/exptrig.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-"""
+r"""
 Exponential, Trigonometric and Hyperbolic Functions
 
 \Mathics basically supports all important trigonometric and hyperbolic functions.
