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Lim(x-->0)((tanx-sinx)/x^3) =lim(x-->0)(sec²;x-cosx)/(3x²;)(羅比達法則) =lim(x-->0)(2secx*secxtanx+sinx)/(6x)(羅比達法則) =lim(x-->0)(2sec³;x*sinx+sinx)/(6x) =lim(x-->0)(2sec³;x+1)/6*(sinx/x) =1/2
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