lim(x趋向0) 1-cos2x/xsinx
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lim(x趋向0)1-cos2x/xsinxlim(x趋向0)1-cos2x/xsinxlim(x趋向0)1-cos2x/xsinxlim2sinx/x=2
lim(x趋向0) 1-cos2x/xsinx
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