code: public JcNumber y(Number yval) {
  		JcNumber sub = new JcNumber(yval, this.xVal, OPERATOR.Common.COMMA_SEPARATOR); 
  		return new JcNumber(null, sub,
  				new FunctionInstance(FUNCTION.Math.ATAN2, 2));
  	}
docs: <div color='red' style="font-size:24px;color:red"><b><i><u>JCYPHER</u></i></b></div>
  <div color='red' style="font-size:18px;color:red"><i>return the arctangent2 of a set of coordinates (x, y), in radians;</i></div>
  <div color='red' style="font-size:18px;color:red"><i>specify the y coordinate, return a <b>JcNumber</b></i></div>
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