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5、an1)4tan(,?nnnaatan1tan2?2lim?nnna?1|nn?()$%&?14tannna?5.?(1)limn?0)2(642)12(531?222?222nn?(2)limn?0)()2)(1()()2)(1(?nn?(?0)?1?limn?222?222)2(642)12(531nn?1212nnn?()$%&?1211nn?()$%&?n211ln?)(21?nn?()$%&?121nn?()$%&?1211lnnn?limn?222?222)2(642)12(531nn?02111?()$%&?nn?2?limn?)()2)(1()()2)(1(nn?0nnn?()
6、$%&?01nn?()$%&?n?1ln?)(?nn?()$%&?1nn?14?()$%&?11lnnn?limn?)()2)(1()()2)(1(nn?010?()$%&?nn?6.?q?1?1)1(nnq?112)1(1nnq?nP?nkkq1)1(?nP2?nkkq21)1(?nkknkkqq21212)1()1(?2?nknkkknkkqqq11122212)1()1()1(?nkknnkkqq112212)1()1(?12)1(nnq1)1(lim212?nnkknq?nnP2lim?112)1(1nnq?12limnnPnnP2lim?nnPlim?1)1(nnq?112)1(1nnq?7.?nan112?nan12?+()$%&?nn111?1nna?12nna?2)1(nna?nkknaS1?()$%&?nknkkS12111?()$%&?kk111?)(1?kk?nlim?()$%&?nknnkkS12111lim?1nnanan12.?12nna 15?nkknaP1)1(?nP2()$%&?()$%&?)11(111111kkkknk?()$%&?nkk1211?nnP2lim?12limnnPnnP2lim?nnP?lim?2)1(nna 16