「ガウス積分-レベル1」 -2014/8-
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√Pi~1.78
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${exp(-x)*dx}[x:0~∞]=1 ${exp(-x^2)*dx}[x:0~∞]=√Pi/2~0.89
${x^2*exp(-x^2)*dx}[0~∞]=√Pi/4~0.44
${x*exp(-x^2)*dx}[x:0~∞]=0.5 ${x^3*exp(-x^2)*dx}[x:0~∞]=0.5
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${exp(-a*x)*dx}[x:0~∞]=1/a
${exp(-a*x^2)*dx}[x:0~∞]=(√Pi/2)/√a
${x^2*exp(-a*x^2)*dx}[0~∞]=(√Pi/4)/a^(3/2)
${x*exp(-a*x^2)*dx}[x:0~∞]=(1/2)/a
${x^3*exp(-a*x^2)*dx}[x:0~∞]=(1/2)/a^2
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