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317.解：，sina=QE24cosa =-1-sin2 a =52.sin 2a =2sing osa2437524sin 2atan 2a2524cos 2a7725
第二节书面表达One possible version:Dear Sir or Madam,I'm Li Hua,an exchange student studying in ourschool.Knowing that you're planning to start some schoolelubs about Chinese culture,I'm writing and trying tomake a suggestion.My suggestion is that a Chinese painting club shouldbe established.For one reason,Chinese painting is a formof art with a long history,which stands for the civilization ofancient China.For another,the elub may appeal to moremembers -not only Chinese students,but also otherstudents,because there is no language barrier to appreciateart.I would be grateful for your taking my advice into goodconsideration.Looking forward to hearing from you.Yours sincerely,Li Hua
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