和差角公式练习题1已知∈(2,),sin=53,则tan(4)等于A.71B.7C.-71D.-72sin163°sin223°+sin253°sin313°等于()A.-21B.21C.-23D.23370sin20sin10cos2的值是()A.21B.23C.3D.24已知cos-cosβ=21,sin-sinβ=31,则cos(-β)=_______.5已知A、B为锐角,且满足tantantantan1ABAB,则cos()AB=_____.6化简1tan151tan15等于()()A3()B32()C3()D17已知∈(0,2π),β∈(2π,π),3sin5,4cos()5,则sin____.8在△ABC中,cosA=53且cosB=135,则cosC等于()A.-6533B.6533C.-6563D.65639若3sinx-3cosx=23sin(x+φ),φ∈(-π,π),则φ等于()A.-6B.6C.65D.-6510已知cosα=71,cos(α+β)=-1411,α、β∈(0,2π),则β=.11要使46sin3cos4mm有意义,则m的取值范围为)(,3cos2cos3sin2sin12的值是则若xxxxx._________sinsincoscos13.________3sin,2,23,51cos14则若15)120tan3(10cos70tan=________________.)(37sin83sin37cos7sin16的值为(A)23(B)21(C)21(D)2317设cos(-2)=-91,sin(2-β)=32,且2π<<π,0<β<2π,求cos(+β).