>>964
π = 12∫[x:0→2-√3] 1/(1+x^2) dx
< 12∫[x:0→2-√3] (1 -x^2 +x^4) dx
= 12 [ x -(1/3)x^3 +(1/5)x^5 ](x=0、2-√3)
= 4 (986 - 567√3) /5
= 3.1417537
さて、どうするか?