abs(sin(z))
<a href="//commons.wikimedia.org/wiki/User:Pengo" title="User:Pengo">Pengo</a>
<span class="int-own-work" lang="en">Own work</span>, based on <a href="//commons.wikimedia.org/wiki/File:Complex_sine.svg" title="File:Complex sine.svg">Complex sine.svg</a> by <a href="//commons.wikimedia.org/wiki/User:Farry" title="User:Farry">Dave Farrance</a> (public domain).