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原式=lim(x→0)(tanx-x)/x^3 (tanx~x) =lim(x→0)(1/cos^2(x)-1)/(3x^2) (洛必達法則) =lim(x→0)sin^2(x)/(3x^2)*lim(x→0)1/cos^2(x) =1/3*1 (sinx~x) =1/3
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