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课时作业51诱导公式二、三、四基础强化1.如果α+β=180°,那么下列等式中成立的是()A.cosα=cosβB.cosα=-cosβC.sinα=-sinβD.sinα=cosβ2.tan(-5π6)=()A.33B.3C.-3D.-333.已知角α的顶点与原点O重合,始边与x轴的非
负半轴重合,它的终边过点P(-35,-45),则cos(π-α)的值是()A.-35B.35C.-45D.454.若sin(π+α)=12,α∈(π,3π2),则tan(3π-α)=()A.-12B.-32C.-3D.-335.(多选)已知cos(π-α)=-34,则sin(-2π
-α)=()A.-45B.-74C.74D.456.(多选)在△ABC中,下列关系一定成立的是()A.sinA+sinC=sinBB.sin(A+B)=sinCC.cos(B+C)=-cosAD.tan(A+C)=
-tanB7.计算sin2(π-θ)+cos2(-θ)=________.8.已知sinα=45,则sin(α-2π)sin(π+α)=________.9.求值:(1)sin4π3·cos25π4·tan5π6;(2)cosπ5+cos2π5+cos3π5+cos4π5.10.化简:
(1)cos(360°+α)·sin(360°-α)cos(-α)·sin(-α);(2)cos(θ+π)·sin2(θ+3π)tan(θ+4π)·tan(θ-π)·cos2(-π-θ).能力提升11.已知sin(α-π)+cos(π
-α)sin(-α)+cos(2π-α)=3,则tanα=()A.-2B.2C.-3D.312.已知sin(π7-x)=-23,则sin(6π7+x)=()A.23B.53C.-23D.-5313.化简:1+2sin(π-2
)·cos(π-2)=()A.sin2+cos2B.cos2-sin2C.sin2-cos2D.±(cos2-sin2)14.(多选)已知n∈Z则下列三角函数中,与sinπ3数值相同的是()A.sin(nπ+4π3)B.cos(2nπ+π6)
C.sin(2nπ+π3)D.cos(2n+1)π-π615.已知cos(π6+α)=33,则cos(5π6-α)=________.16.已知f(α)=sin(α-3π)·cos(2π-α)·cos
(π+α)cos(-π-α)·sin(-π-α).(1)化简f(α);(2)若α为第四象限角且sinα=-35,求f(α)的值;(3)若α=-313π,求f(α).