A few places we used an option of 'imaginaryi', which isn't a real option. …

A few places we used an option of 'imaginaryi', which isn't a real option.  Doesn't change any behavior.

common/lib/sandbox-packages/symmath/formula.py

@@ -736,4 +736,4 @@ def test6():		# imaginary numbers
   </mstyle>
 </math>
 '''
-    return formula(xmlstr, options='imaginaryi')
+    return formula(xmlstr, options='imaginary')

common/lib/xmodule/test_files/symbolicresponse.xml

@@ -16,12 +16,10 @@ real time, next to the input box.
   <text>Compute [mathjax] U = \exp\left( i \theta \left[ \begin{matrix} 0 &amp; 1 \\ 1 &amp; 0 \end{matrix} \right] \right) [/mathjax]
       and give the resulting \(2 \times 2\) matrix. <br/>
       Your input should be typed in as a list of lists, eg <tt>[[1,2],[3,4]]</tt>. <br/>
-       [mathjax]U=[/mathjax]
-
-    <symbolicresponse answer="[[cos(theta),I*sin(theta)],[I*sin(theta),cos(theta)]]" options="matrix,imaginaryi" >
-        <textline size="80" math="1" />
-    </symbolicresponse>
-  <br/>
+       [mathjax]U=[/mathjax] <symbolicresponse cfn="symmath_check" answer="[[cos(theta),I*sin(theta)],[I*sin(theta),cos(theta)]]" options="matrix,imaginary" id="filenamedogi0VpEBOWedxsymmathresponse_1" state="unsubmitted">
+          <textline size="80" math="1" response_id="2" answer_id="1" id="filenamedogi0VpEBOWedxsymmathresponse_2_1"/>
+        </symbolicresponse>
+      <br/>
   </text>
 
 </text>

common/test/data/full/problem/test_files/symbolicresponse.xml

@@ -19,7 +19,7 @@ from symmath import *
   <text>Compute [mathjax] U = \exp\left( i \theta \left[ \begin{matrix} 0 &amp; 1 \\ 1 &amp; 0 \end{matrix} \right] \right) [/mathjax]
       and give the resulting \(2 \times 2\) matrix. <br/>
       Your input should be typed in as a list of lists, eg <tt>[[1,2],[3,4]]</tt>. <br/>
-       [mathjax]U=[/mathjax] <symbolicresponse cfn="symmath_check" answer="[[cos(theta),I*sin(theta)],[I*sin(theta),cos(theta)]]" options="matrix,imaginaryi" id="filenamedogi0VpEBOWedxsymmathresponse_1" state="unsubmitted">
+       [mathjax]U=[/mathjax] <symbolicresponse cfn="symmath_check" answer="[[cos(theta),I*sin(theta)],[I*sin(theta),cos(theta)]]" options="matrix,imaginary" id="filenamedogi0VpEBOWedxsymmathresponse_1" state="unsubmitted">
           <textline size="80" math="1" response_id="2" answer_id="1" id="filenamedogi0VpEBOWedxsymmathresponse_2_1"/>
         </symbolicresponse>
       <br/>