V=(π/4)∫[x=0〜1] (e^x+e^-x)^2 dx = (π/4)∫[x=0〜1] e^(2x)+2+e^(-2x) dx =
(π/4){e^(2x)/2+2x-e^(-2x)/2}[x=0〜1] = (π/4){(e^2+e^(-2))/2 + 2}