かげは@歌い手の投稿

((e^(iπ)+1)/(-1+1))*(Γ(1)*ζ(2)/(π^2/6))*sqrt((∫_0^1(1-x^2)dx)/(2/3))*(sin(π/2)^2/1)*(Σ_{n=1}^∞2^-n/1)=1