0,	0,	"#DIV/0!"
1,	1,	0.785398163397
-1,	-1,	-2.356194490192
-1,	1,	2.356194490192
1,	-1,	-0.785398163397
0.5,	1,	1.107148717794
-0.5,	2,	1.815774989922