Fix precalculus pdf build

source/precalculus/source/02-FN/05.ptx

@@ -610,14 +610,14 @@ Let functions <m>p</m> and <m>q</m> be given by the graphs below. </p>
 <activity>
   <introduction>
     <p>
-      Suppose you have a <m>$50</m>-off coupon and there is a <m>15\%</m>-off sale on a TV. If you are allowed to apply both the coupon and sale price of the TV, which one should you apply first? Let's investigate to determine the better deal.
+      Suppose you have a <m>\$50</m>-off coupon and there is a <m>15\%</m>-off sale on a TV. If you are allowed to apply both the coupon and sale price of the TV, which one should you apply first? Let's investigate to determine the better deal.
     </p>
   </introduction>
 
   <task>
     <statement>
       <p>
-        Write a cost function, <m>C(p)</m>, for the price of the TV, <m>p</m>, if you applied the <m>$50</m>-off coupon.
+        Write a cost function, <m>C(p)</m>, for the price of the TV, <m>p</m>, if you applied the <m>\$50</m>-off coupon.
       </p>
     </statement>
     <answer>
@@ -681,7 +681,7 @@ Let functions <m>p</m> and <m>q</m> be given by the graphs below. </p>
   <task>
     <statement>
       <p>
-        Suppose the original cost of the TV is <m>$500</m>. Determine the cost of the TV if you applied the coupon first.
+        Suppose the original cost of the TV is <m>\$500</m>. Determine the cost of the TV if you applied the coupon first.
       </p>
     </statement>
     <answer>
@@ -695,15 +695,15 @@ Let functions <m>p</m> and <m>q</m> be given by the graphs below. </p>
         <m>S(C(500))=382.50</m> 
       </p>
       <p>
-        When applying the coupon first, the reduced cost of the TV is <m>$382.50</m>.
+        When applying the coupon first, the reduced cost of the TV is <m>\$382.50</m>.
       </p>
     </answer>
   </task>
 
   <task>
     <statement>
       <p>
-        Suppose the original cost of the TV is <m>$500</m>. Determine the cost of the TV if you applied the <m>15\%</m>-off sale first.
+        Suppose the original cost of the TV is <m>\$500</m>. Determine the cost of the TV if you applied the <m>15\%</m>-off sale first.
       </p>
     </statement>
     <answer>
@@ -717,7 +717,7 @@ Let functions <m>p</m> and <m>q</m> be given by the graphs below. </p>
         <m>S(C(500))=375</m>
       </p>
       <p>
-        When applying the <m>15\%</m>-off sale first, the reduced cost of the TV is <m>$375</m>.
+        When applying the <m>15\%</m>-off sale first, the reduced cost of the TV is <m>\$375</m>.
       </p>
     </answer>
   </task>
@@ -730,7 +730,7 @@ Let functions <m>p</m> and <m>q</m> be given by the graphs below. </p>
     </statement>
     <answer>
     <p>
-      When applying the coupon first, the TV would cost <m>$382.50</m>. If applying the <m>15\%</m>-off sale first, however, the TV would cost <m>$375</m>. Applying the <m>15\%</m>-off sale first is the better deal, saving you <m>$125</m> (versus <m>$117.50</m>)! 
+      When applying the coupon first, the TV would cost <m>\$382.50</m>. If applying the <m>15\%</m>-off sale first, however, the TV would cost <m>\$375</m>. Applying the <m>15\%</m>-off sale first is the better deal, saving you <m>\$125</m> (versus <m>\$117.50</m>)! 
     </p>
   </answer>
   </task>

source/precalculus/source/08-TE/02.ptx

@@ -123,7 +123,7 @@
       </statement>
       <answer>
         <p>
-          <m>{\frac{\tan\theta - \cot\theta}{\sin\theta\cos\theta}</m> can be rewritten as <m>\frac{\tan\theta}{\sin\theta\cos\theta}-\frac{\cot\theta}{\sin\theta\cos\theta}</m>
+          <m>\frac{\tan\theta - \cot\theta}{\sin\theta\cos\theta}</m> can be rewritten as <m>\frac{\tan\theta}{\sin\theta\cos\theta}-\frac{\cot\theta}{\sin\theta\cos\theta}</m>
         </p>
       </answer>
     </task>