X趋于0,求极限lim[(1-cosX)/(XtanX)]
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lim(X->0)[(1-cosX)/(XtanX)]
=lim(X->0)[sin(x/2)]^2/(XtanX)
=lim(X->0)(X/2)^2/(X*X)
=1/4
=lim(X->0)[sin(x/2)]^2/(XtanX)
=lim(X->0)(X/2)^2/(X*X)
=1/4
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