--- manmake/wester-1994.chapt.txt.orig	2012-09-26 12:02:56.000000000 +0200
+++ manmake/wester-1994.chapt.txt	2012-09-26 12:03:11.000000000 +0200
@@ -96,7 +96,7 @@
 *	62. (OK) Invert a 2x2 symbolic matrix.
 	Verify(Simplify(Inverse({{a,b},{1,a*b}})),
 	  {{a/(a^2-1), -1/(a^2-1)},
-	  {-1/(b*(a^2-1)), a/(b*(a^2-1))}});
+	  {-1/((a^2-1)*b), a/((a^2-1)*b)}});
 *	63. (BUG) Compute the determinant of the 4x4 Vandermonde matrix.
 	Factor(Determinant(VandermondeMatrix
 	  ({a,b,c,d})));
