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内蒙古开鲁县蒙古族中学2017_2018学年高一数学下学期第三次周测试题（无答案）.doc

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1 -内蒙古开鲁县蒙古族中学 2017-2018 学年高一数学下学期第三次周测试题（无答案）三角恒等变化检测题（50 分）一、选择题（每题 5 分，共 25 分）1. ( ) 70cos40sin1iA B C D.22323212. 的值是 ( ) 1cossinA B C D 22223. ( ) 的 结 果 为化 简 sinx6coA. B. 3s2x3sin2C. D.xinco4. 在 中，如果 那么这个三角形是 ( ) ABC BCAsin2siA 锐角三角形 B.直角三角形 C.等腰三角形 D等边三角形5. 的 值 为， 则，如 果 ta41ta3tan( )A B C D121137132二、填空题（每题 5 分，共 15 分）6.已知 ， 是第四象限角，则 =_3sin4sin7. 的值等于_15ta8.若 _tan53coscos则，- 2 -三、化简证明题（每题 5 分）9.化简 sin817cosin10.证明 并求22sinisini 40sin8i0si2

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