1、高考资源网() 您身边的高考专家(2012阜阳质检)sin105的值是()A.B.C. D.解析:选A.sin105sin(6045)sin60cos45cos60sin45.化简cos(xy)sinysin(xy)cosy等于()Asin(x2y) Bsin(x2y)Csinx Dsinx解析:选D.原式sinycos(xy)cosysin(xy)siny(xy)sin(x)sinx.式子cos24cos54sin24cos36的值是_解析:原式sin36cos24cos36sin24sin(3624)sin60.答案:(2012亳州调研)化简:cos()sin()_解析:原式coscoss
2、insinsincoscossincossincos sincos.答案:cosA级基础达标sin65cos35cos65sin35等于()A.B.C D解析:选A.原式sin(6535)sin30.(2012驻马店调研)cossin可化为()Asin BsinCsin Dsin解析:选C.cossinsincoscossinsin.(2011高考浙江卷)若0,0,cos(),cos(),则cos()()A. BC. D解析:选C.根据条件可得(,),(,),所以sin(),sin(),所以cos()cos()()cos()cos()sin()sin().若cos(),则(sinsin)2(c
3、oscos)2_解析:原式22cos()22.答案:函数f(x)sin2xcos2x的最小正周期是_解析:f(x)sin2xcos2x2(sin2xcoscos2xsin)2sin(2x)最小正周期T.答案:求值:(1)sin165,sin195;(2)sin80cos35sin35sin10.解:(1)sin165sin(18015)sin15sin(4530)sin45cos30cos45sin30,sin195sin(18015)sin15.(2)sin80cos35sin35sin10sin80cos35cos80sin35sin45.B级能力提升已知向量a(cos75,sin75),
4、b(cos15,sin15),那么|ab|等于()A. B.C. D1解析:选D.|ab|1.(2012汉中高一检测)为了得到函数ysin2xcos2x的图像,只需把函数ysin2xcos2x的图像()A向左平移个单位长度B向右平移个单位长度C向左平移个单位长度D向右平移个单位长度解析:选A.sin2xcos2xsin(2x)sin2(x),sin2xcos2xsin(2x)需将ysin2xcos2x向左平移个单位长度得到ysin2xcos2x的图像(2012咸阳高一检测)已知sin,则cossin的值为_解析:由条件知cos,cos()coscossinsin().原式cos2()()2.答
5、案:将下列各式写成Asin(x)的形式(1)sinxcosx;(2)sin(x)cos(x)解:(1)sinxcosx2(sinxcosx)2(cossinxsincosx)2sin(x)(2)原式sin(x)cos(x)sinsin(x)coscos(x)cos(x)cos(x)sin(x)(创新题)已知函数f(x)2sin ,xR.(1)求f()的值;(2)设,f,f(32),求cos ()的值解:(1)f2sin 2sin 2.(2)f2sin 2sin ,sin .f(32)2sin 2sin 2cos ,cos .,cos ,sin ,cos ()cos cos sin sin . 高考资源网版权所有,侵权必究!