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课时作业52诱导公式五、六基础强化1.已知cos(π2+α)=35,那么sinα=()A.-45B.45C.-35D.352.已知角α的终边经过点P(-3,-4),则cos(3π2-α)=()A.-35B.-45C.35D.453.若cos(π2+θ)>0,且sin(π
2-θ)<0,则θ是()A.第一象限角B.第二象限角C.第三象限角D.第四象限角4.若sin(α+π6)=13,则cos(α+2π3)=()A.13B.-13C.79D.-795.(多选)下列选项中与cosθ的值不恒相等的有()A.cos(-θ)B.cos(π+θ)C
.sin(θ-π2)D.sin(32π-θ)6.(多选)已知sinx=35,x∈(0,π2),则()A.sin(π-x)=35B.sin(x-π)=45C.sin(π2-x)=45D.sin(x-3π2)=457.已知sin(7π2+α)=-45,那么cosα的值为___
_____.8.已知角θ的终边经过点(3,-22),则cos(θ+3π2)=________.9.已知α为第二象限角,sin(π2-α)=-45.(1)求sinα的值;(2)若f(α)=cos(π2-α)tan(-π+α)cos(2π-α)-tan(-19
π-α)sin(5π-α)sin(π+α),求f(α)的值.10.已知函数f(x)=sinx·sin(x-3π2)cos(-3π-x)·tanx.若f(θ)=-13f(3π2-θ),求cosθ+2sinθ2cosθ-sinθ+10sin2θ的值.能力
提升11.若cos(π12-α)=12,则sin(5π12+α)=()A.12B.-12C.32D.-3212.已知cos(π3-α)=35,则sin(α+7π6)=()A.35B.45C.-45D.-3513.已知sin(53°-α)=15且-270°<α
<-90°,则sin(37°+α)=()A.15B.-15C.265D.-26514.(多选)已知sin(π3-x)=-513,且π3<x<π2,则()A.sin(π6+x)=-513B.cos(2π3+x)=-1213C.tan(x-π3)=512D.cos(5π6-x)=5
1315.已知cos(π3-α)=33,则sin(π6+α)+cos(2π3+α)=________.16.已知sin(5π6-α)=13.(1)求cos(α-π3);(2)若-π6<α<π3,求cos(π6+α).