lim(x趋近0)(1/x2-1/xsinx)
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lim(x->0)[1/x^2-1/(xsinx)]
=lim(x->0)(sinx- x)/(x^2.sinx) (0/0)
=lim(x->0)(cosx- 1)/(x^2.cosx + 2xsinx) (0/0)
=lim(x->0) -sinx/(-x^2.sinx +4xcosx+ 2sinx)
=lim(x->0) -1/(-xsinx +4cosx+ 2)
=-1/6
=lim(x->0)(sinx- x)/(x^2.sinx) (0/0)
=lim(x->0)(cosx- 1)/(x^2.cosx + 2xsinx) (0/0)
=lim(x->0) -sinx/(-x^2.sinx +4xcosx+ 2sinx)
=lim(x->0) -1/(-xsinx +4cosx+ 2)
=-1/6
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