echo( "Random Vector: ",rands(5,15,4,42));
echo( "abs: ",abs(-9));
echo( "sign: ",sign(9));
echo( "sign: ",sign(-9));
echo( "cos: ",cos(9));
echo( "sin: ",sin(9));
echo( "tan: ",tan(9));
echo( "acos: ",acos(0.1));
echo( "asin: ",asin(0.1));
echo( "atan: ",atan(9));
echo( "atan2: ",atan2(1,2));

echo( "min: ",min(1,2));
echo( "max: ",max(1,2));
echo( "pow: ",pow(1,2));
echo( "sqrt: ",sqrt(2));
echo( "ln: ",ln(1));

echo( "ceil: ",ceil(2.5));
echo( "ceil: ",ceil(-2.5));
echo( "floor: ",floor(2.5));
echo( "floor: ",floor(-2.5));
echo( "log: ",log(10));
echo( "log: ",log(10,2));
echo( "exp: ",exp(2));

echo("sign");
echo(sign(-5.0));
echo(sign(0));
echo(sign(8.0));

echo("round");
echo(round(2.5));// = x+1.
echo(round(2.49));// = x.
echo(round(-(2.5)));// = -(x+1).
echo(round(-(2.49)));// = -x.

echo(round(5.4));// //-> 5
echo(round(5.5));// //-> 6
echo(round(5.6));// //-> 6

sphere();