x趋向0 lim(cot x- 1/x)=?
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x趋向0 lim(cot x- 1/x)=?
x趋向0 lim(cot x- 1/x)=?
x趋向0 lim(cot x- 1/x)=?
x→0时cotx-1/x
=cosx/sinx-1/x
→(cosx-1)/x
=-2[sin(x/2)]/x
→-2(x/2)^2/x
=-x/2→0.
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