0597132人目の素数さん垢版 | 大砲2018/11/08(木) 08:40:16.46ID:45SX77TX >>596 V = ∫[0,1] S(y) dy = 2∫[0,1] { (1-yy)arctan(√y) - (1-y)√y } dy = 2 [ (1/3)(2-y)(1+y)^2 arctan(√y) - (1/45)(30+35y-21yy)√y ](0,1) = 2 (π/3 - 44/45) = 0.13883954683764