Merge pull request AllenDowney#49 from jorge-e/patch-2

AllenDowney · web-flow · commit 24b4e8b8a753 · 2019-10-10T20:56:41.000-04:00
Adding a comma that can make a difference
diff --git a/book/book.tex b/book/book.tex
@@ -2028,7 +2028,7 @@ \section{Math functions}
 
 If you know
 trigonometry, you can check the previous result by comparing it to
-the square root of two divided by two:
+the square root of two, divided by two:
 \index{sqrt function}
 \index{function!sqrt}
 
