how to put Two function in one button – Blancer.com Tutorials and projects

here is my code in short version
<script type="text/javascript"> wwr_start(); function onSliderChanged(slider) { wwr_req(SET/TRACK/${slider.id}/VOL/${slider.value}); } function mutetrack(track) { wwr_req(SET/TRACK/${track.id}/MUTE/-1`);
}

<body>
    
    <input type="button" value="Coach mic MUTE" id="76" background-color: white onclick="mutetrack(this);myFunction()
       ">
<body>
    <input type="button" value="Coach head MUTE" id="70" background-color: white onclick="mutetrack(this);myFunction2()
   ">

‘
previsouly, i needed two seperate btn to mute specific single track. Now condition has changed,i need a btn to mute both (two or perhaps more i’m not totally sure yet) track. i’m pretty new in coding wolrd. just started html,javascript couple weeks ago.
Please somebody help me!! thank you!!

i need solution!! thank you