1.x趋向0 lim (cosx-1)/x 2.x趋向0 lim sinx/x
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1.x趋向0 lim (cosx-1)/x 2.x趋向0 lim sinx/x
1.x趋向0 lim (cosx-1)/x 2.x趋向0 lim sinx/x
1.x趋向0 lim (cosx-1)/x 2.x趋向0 lim sinx/x
2.x趋向0 lim sinx/x=1,这个已经是公式了
证明:
2sinx
1.x趋向0 lim (cosx-1)/x 2.x趋向0 lim sinx/x
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