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4. 譜x12nn?n2?1?n2?2?L?n2?n��箔limn??xn;
5. 譜x11n?n2?1?1n2?2?L?n2?n��箔limn??xn;
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2. 喇痕方y?arctanx議夕侘深賀自��xlim???arctanx;xlim???arctanx; limarctanx??x;
3. 箔和双痕方自�泯�
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