There's no nice way of saying this, and I mean no malice here, but I think you're exceptionally confused or ignorant, and I don't think it would be rewarding for either of us to continue this conversation.
for x in range(0, 90): for y in range(0, 90): if xx + yy < 90*90: # it is in circle
So for the each x, the one that has the greatest y will be the sin.
Something like floatrange(0,1,0.001) may work too.
You can think whatever you want, that's no substitute for being correct.