Example ex4-201

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Next: ex4-202

A B a b θ N

<math>
<apply>
  <eq/>
  <apply><vectorproduct/>
    <ci type="vector"> A </ci>
    <ci type="vector"> B </ci>
  </apply>
  <apply><times/>
    <ci> a </ci>
    <ci> b </ci>
    <apply><sin/>
      <ci> θ </ci>
    </apply>
    <ci type="vector"> N </ci>
  </apply>
</apply>
</math>