1《诱导公式》练习一、选择题1、下列各式不正确的是()A.sin(α+180°)=-sinαB.cos(-α+β)=-cos(α-β)C.sin(-α-360°)=-sinαD.cos(-α-β)=cos(α+β)2、若sin(π+α)+sin(-α)=-m,则sin(3π+α)+2sin(2π-α)等于()A.-23mB.-32mC.23mD.32m3、619sin的值等于()A.21B.21C.23D.234.的值为()A.B.C.D.5、如果).cos(|cos|xx则x的取值范围是()A.)(]22,22[ZkkkB.)()223,22(ZkkkC.)(]223,22[ZkkkD.)()2,2(Zkkk6.已知函数1tansin)(xbxaxf,满足.7)5(f则)5(f的值为()A.5B.-5C.6D.-67、sin34·cos625·tan45的值是A.-43B.43C.-43D.438.设,1234tana那么)206cos()206sin(的值为()A.211aaB.-211aaC.211aaD.211aa9.若)cos()2sin(,则的取值集合为()2A.}42|{ZkkB.}42|{ZkkC.}|{ZkkD.}2|{Zkk10.对于诱导公式中的角α,下列说法正确的是()A.α一定是锐角B.0≤α<2πC.α一定是正角D.α是使公式有意义的任意角11.已知,则的值为()A.B.-2C.D.二、填空题1、求值:sin160°cos160°(tan340°+cot340°)=.2、若sin(125°-α)=1213,则sin(α+55°)=.3、cosπ7+cos2π7+cos3π7+cos4π7+cos5π7+cos6π7=.4、已知,1)sin(则)32sin()2sin(.三、解答题1.求cos(-2640°)+sin1665°的值.2.化简:.3、已知3)tan(,求)2sin()cos(4)sin(3)cos(2aaaa的值.4、若cosα=23,α是第四象限角,求sin(2)sin(3)cos(3)cos()cos()cos(4)的值.5、设sin,(0)()(1)1,(0)xxfxfxx和1cos,()2()1(1)1,()2xxgxgxx求)43()65()31()41(fgfg的值.