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<math xmlns='http://www.w3c.org/mathml' version='2.0'>
<apply> <eq/>
<apply> <times/>
<cn> 2 </cn>
<apply> <cos/>
<ci> α </ci>
</apply>
<apply> <cos/>
<ci> β </ci>
</apply>
</apply>
<apply> <plus/>
<apply> <cos/>
<apply> <plus/>
<ci> α </ci>
<ci> β </ci>
</apply>
</apply>
<apply> <cos/>
<apply> <minus/>
<ci> α </ci>
<ci> β </ci>
</apply>
</apply>
</apply>
</apply>
</math>
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