(x/2)√(3 - x^2)+(3/2) ArcSin[x/√3]⋍σ⋍9.8σ

∫√(3 - x^2)dx	の	積分は計算できる(x=1代入)
(x/2)√(3 - x^2)	+	(3/2) ArcSin[x/√3]			⋍	σ	⋍	9.8σ	;	文献値
1		0.707107	+	0.9232196	⋍	1.630326	⋍	15.9772	;	14.13472
(x/2)√(5 - x^2)	+	(5/2) ArcSin[x/√5]
1		1	+	1.1591190	⋍	2.159119	⋍	21.15937	;	21.02203
(x/2)√(7 - x^2)	+	(7/2) ArcSin[x/√7]
1		1.224745	+	1.3565884	⋍	2.581333	⋍	25.29707	;	25.01085
(x/2)√(9 - x^2)	+	(9/2) ArcSin[x/√9]
1		1.414214	+	1.5292661	⋍	2.943480	⋍	28.8461	;	30.42487