diff --git a/book/book.tex b/book/book.tex
index 79c9e879..50655b78 100644
--- a/book/book.tex
+++ b/book/book.tex
@@ -4001,7 +4001,7 @@ \section{Complex signals}
 
 \section{The synthesis problem}
 
-Just as we did with real sinusoids, we we can create compound signals
+Just as we did with real sinusoids, we can create compound signals
 by adding up complex sinusoids with different frequencies.  And that
 brings us to the complex version of the synthesis problem: given the
 frequency and amplitude of each complex component, how do we evaluate the