eq12.png" alt="cos w+sin">


<p>or in a slightly more compact form:
</p>

<!-- LATEX \sum_{n=-\infty}^{\infty} \! \! J_{n}(B)\cos(\omega_{c} + n\omega_{m})t -->

<img class="indented" src="pix/fmeq13.png" alt="sum J cos">


<!-- LATEX J_{-n}(x) = (-1)^{n}J_{n}(x) -->

<p>Here we are using the fact that
<img src="pix/fmeq14.png" alt="J - J">.
We can change our point of view on the first part of the expansion given above, and ask for the 
amplitude of a given sideband:
</p>

<!-- LATEX J_{n}(B) = \frac{2}{\pi