Report - 成都七中 2015 届数学阶段性测试题（理科）...30 p) —c 8. 2sina—cosa— 2 B 4sin2a—4sinacos a+cos2a., 3 sin2a—4sinacos (sin2a+cos2a), 2 f (l) (1.2] tan tana=——

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