=lim(1/x^2)(x/tanx-1)
=lim(1/x^2)(xcosx/sinx-1)
=lim(1/x^2)(cosx-1)
=lim(cosx-1)/x^2
分子分母分别求导
=lim(-sinx)/2x
=-1/2
求极限：lim（x趋于0）（1/（xtanx)-1/x^2)
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