update

doc/src/week35/week35.do.txt

@@ -2915,7 +2915,7 @@ Show that
 and
 !bt
 \[
-\frac{\partial (\bm{a}^T\bm{A}\bm{a})}{\partial \bm{a}} = (\bm{A}+\bm{A}^T)\bm{a},
+\frac{\partial (\bm{a}^T\bm{A}\bm{a})}{\partial \bm{a}} = \bm{a}^T(\bm{A}+\bm{A}^T),
 \]
 !et
 and
@@ -2953,3 +2953,5 @@ and written out in terms of the vector $\bm{x}$ we have
 \frac{\partial f(\bm{x})}{\partial \bm{x}}= \bm{A}.
 \]
 !et
+
+