Math, Art, Programming ,Simple formulas

Hi steemians!!!

That's is my simple formulas fractals , simple png file generated by php code:

$px = ($x - width / 2) / $zoom;
$py = ($y - height / 2) / $zoom;
if (sin($px$py)sinh($py*10)>0)

sin($px$py)cos($py*10)>0

sin($px*$y)>0