lim (x→0)(∫(上x下0)(1-cost)dt)/x^3
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limx→0[∫(0→x)cost^2dt]/[∫(0→x)(sint)/tdt]
求极限 lim x→0 ∫sin t^2 dt / x^3 从2x积到0
求极限lim(x→+∞)∫[0,x](arctant)²dt/√(x²+1)
急求极限lim(x→0){∫(从cos x到1)e^(-t^2)dt}/x^2 ;