河北省武邑中学2018_2019学年高一数学12月月考试题201901090146.doc

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1、1河北武邑中学 2018-2019 学年高一年级上学期 12 月份月考数 学 试 卷一、选择题:本大题共 12 个小题,每小题 5 分,共 60 分在每小题给出的四个选项中,只有一项是符合题目要求的1下列几何体是组合体的是( )2对于命题 ,使得 ,则 是A , B ,C , D , 3已知函数 ,且 ,则实数 a 的值是( )A 1 B 2 C 3 D 44. 已知角 的终边经过点(4,3),则 cos ( )A. B. C D45 35 35 455. 若 sincos0 又 0 0 即21x12()xx12()fxf12()fxf 在 上为减函数。 ()f,)22(1)法一:联立方程Er

2、ror!由得 cos sin ,将其代入,整理得1525sin2 5sin 120. 是三角形内角,Error!tan .43法二:sin cos ,(sin cos )2 2,15 (15)即 12sin cos ,1252sin cos ,2425(sin cos )212sin cos 1 .2425 4925sin cos 0 且 0 ,1225sin 0, cos 0, sin cos 0.sin cos .75由Error!得Error!tan .43(2) 1cos2 sin2 sin2 cos2 cos2 sin2 sin2 cos2 cos2 cos2 sin2 cos2 .tan2 11 tan2 tan ,43 .1cos2 sin2 tan2 11 tan2 ( 43)2 11 ( 43)2 257

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