Arg	Res
0	1
0.5	0.8775
0.3	0.9553
0.7	0.7648
0.9	0.6216
1	0.5403
1.2	0.3623
1.5	0.0707
1.57	0
1.7	-0.1288
1.9	-0.3232
2.2	-0.5885
2.5	-0.801
2.8	-0.9422
3	-0.9899
3.14	-0.9999