目标测试题五正弦、余弦的诱导公式一、选择题:1.已知sin(4π+α)=23,则sin(43π-α)值为()A.21B.—21C.23D.—232.cos(+α)=—21,23πα2,sin(2-α)值为()A.23B.21C.23D.—233.化简:)2cos()2sin(21得()A.sin2+cos2B.cos2-sin2C.sin2-cos2D.±(cos2-sin2)4.已知α和β的终边关于x轴对称,则下列各式中正确的是()A.sinα=sinβB.sin(α-2)=sinβC.cosα=cosβD.cos(2-α)=-cosβ5.设tanθ=-2,2πθ2,那么sin2θ+cos(θ-2)的值等于(),A.51(4+5)B.51(4-5)C.51(4±5)D.51(5-4)二、填空题:6.sin(-317π)=.7.cos(-x)=23,x∈(-,),则x的值为.8.tanα=m,则)cos(-sin()cos(3sin(απα)απ)α.9.|sinα|=sin(-+α),则α的取值范围是.10.若α为锐角,则2|logsecαcos(2-α)=.三、解答题:11.)cos(·3sin()cos()n(s2sin(απα)παπα)πi.12.已知:sin(x+6π)=41,求sin()67xπ+cos2(65π-x)的值.