title: How do I use trig in a shader in WebGL?
body: <p>Is there a way to use a trig function in shaderSourceText?  Should I include a math library somehow?</p>
  
  <pre><code>var shaderSourceText =
  [
      //Shader Source Text
  ].join('\n');
  
  var Shader = gl.createShader(gl.VERTEX_SHADER);
  gl.shaderSource(Shader,shaderSourceText);
  gl.compileShader(Shader);
  </code></pre>