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lim(x-->90°)[(sinx)^3-2(sinx)^2+1]/[sinx-1](0/0型,用洛必達法則) =lim(x-->90°)[3cosx(sinx)^2-4cosx*sinx]/cosx =lim(x-->90°)[3(sinx)^2-4sinx] =3-4=-1
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