<?xml version="1.0" encoding="UTF-8"?>
<quiz>
  <question type="description">
    <name>
      <text>4.3.1.7 Summary of trig identities</text>
    </name>
    <questiontext format="moodle_auto_format">
      <text><![CDATA[<div class="HELM_keypoint">
<h4>Key Point</h4>
\[\begin{aligned}
\tan (A+B) &amp;\equiv \dfrac{\tan A+\tan B}{1-\tan A\tan B} \\
\sin(A-B) &amp;\equiv \sin A\cos B-\cos A\sin B \\
\cos (A-B) &amp;\equiv \cos A\cos B+\sin A\sin B \\
\tan(A-B) &amp;\equiv \dfrac{\tan A-\tan B}{1+\tan A\tan B}
\end{aligned}\]
</div>]]></text>
    </questiontext>
    <generalfeedback format="moodle_auto_format">
      <text/>
    </generalfeedback>
    <defaultgrade>0</defaultgrade>
    <penalty>0</penalty>
    <hidden>0</hidden>
    <idnumber/>
  </question>
</quiz>
