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- 5在等腰梯形ABCD中,AD‖BC,AB=DC=BC,延长BA,CD交于点E,∠E=20°,求∠ACD的度数
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- 9已知函数y=3/2-1/2(sinx-cosx)2 (1)求它的最小正周期和最大值; (2)求它的递增区间.
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