wh-g-013.xml /size: 569 b    last modification: 2020-07-01 14:35
1<math xmlns='http://www.w3c.org/mathml' version='2.0'>
2  <apply> <eq/>
3    <apply> <times/>
4      <cn> 2 </cn>
5      <apply> <cos/>
6        <ci> &alpha; </ci>
7      </apply>
8      <apply> <cos/>
9        <ci> &beta; </ci>
10      </apply>
11    </apply>
12    <apply> <plus/>
13      <apply> <cos/>
14        <apply> <plus/>
15          <ci> &alpha; </ci>
16          <ci> &beta; </ci>
17        </apply>
18      </apply>
19      <apply> <cos/>
20        <apply> <minus/>
21          <ci> &alpha; </ci>
22          <ci> &beta; </ci>
23        </apply>
24      </apply>
25    </apply>
26  </apply>
27</math>