lim(x→0)1/x∫[x,0](1+t^2)*e^(t^2-x^2)dt
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lim(x→0)1/x∫[x,0](1+t^2)*e^(t^2-x^2)dtlim(x→0)1/x∫[x,0](1+t^2)*e^(t^2-x^2)dtlim(x→0)1/x∫[x,0](1+t^2)
lim(x→0)1/x∫[x,0](1+t^2)*e^(t^2-x^2)dt
lim(x→0)1/x∫[x,0](1+t^2)*e^(t^2-x^2)dt
lim(x→0)1/x∫[x,0](1+t^2)*e^(t^2-x^2)dt
原极限
=lim(x→0) ∫[x,0](1+t^2)*e^t^2 dt / [x*e^(x^2)]
=lim(x→0) ∫[x,0](1+t^2)*e^t^2 dt / x 分子分母都趋于0,使用洛必达法则同时求导
=lim(x→0) (1+x^2)*e^x^2 代入x=0
=1
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