Merge pull request #10 from OpenMathBooks/levin-3-1

add additional practice

Author: oscarlevin

source/chap-3.xml

@@ -4,10 +4,10 @@
 <chapter xmlns:xi="http://www.w3.org/2001/XInclude"  xml:id="C-3">
   <title>Using Derivatives</title>
   <xi:include  href="./sec-3-1-rel-rates.xml" />
-  <xi:include  href="./sec-3-2-LHR.xml" />
-  <xi:include  href="./sec-3-3-tests.xml" />
-  <xi:include  href="./sec-3-4-families.xml" />
-  <xi:include  href="./sec-3-5-optimization.xml" />
-  <xi:include  href="./sec-3-6-applied-opt.xml" />
+  <!-- <xi:include  href="./sec-3-2-LHR.xml" /> -->
+  <!-- <xi:include  href="./sec-3-3-tests.xml" /> -->
+  <!-- <xi:include  href="./sec-3-4-families.xml" /> -->
+  <!-- <xi:include  href="./sec-3-5-optimization.xml" /> -->
+  <!-- <xi:include  href="./sec-3-6-applied-opt.xml" /> -->
 </chapter>
 

source/main.ptx

@@ -9,8 +9,8 @@
 
     <xi:include href="./chap-1.xml" />
     <xi:include href="./chap-2.xml" />
-    <!-- 
     <xi:include href="./chap-3.xml" />
+    <!-- 
     <xi:include href="./chap-4.xml" /> -->
     <!-- <xi:include href="./chap-5.xml" /> -->
     <!-- <xi:include href="./chap-6.xml" />