lim(x→0) ∫(0->x) sint/t dt / x^3 (0/0)
=lim(x→0) sinx/x /(3x^2)
=lim(x→0) sinx/(3x^3) (0/0)
=lim(x→0) cosx/(9x^2)
-> 无穷
lim x→0 1/x∧3∫上x下0sint/tdt
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