Example ex4-202

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Next: ex4-203

A B a b θ

<math>
<apply>
  <eq/>
  <apply><scalarproduct/>
    <ci type="vector"> A </ci>
    <ci type="vector">B </ci>
  </apply>
  <apply><times/>
    <ci> a </ci>
    <ci> b </ci>
    <apply><cos/>
      <ci> θ </ci>
    </apply>
  </apply>
</apply>
</math>