Display:

Source:

<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> &theta; </ci>
          </apply>
     </apply>
</apply>