原式=lim(x->0){[∫(sinx,0)cos(t²)dt]/x}
=lim(x->0)[-cosx*cos(sinx)²] (0/0型极限,应用罗比达法则)
=(-1)*1
=-1
lim(x->0)1/x∫（0到sinx）cos(t^2)dt
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