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两角和与差练习题一、选择题:1.sin75cos105sin105sin15的值等于()11A.B.C.0D.1222.已知,sin()=,则cos的值为()3(0,)365A.-433B.343C.433D.43310101010(A)(B)(C)(D)106544、tan11°+tan19°+tan11°tan19°的值是()33A.3B.3C.0D.135.已知,()tan()3,tan()3则tan2的值是A.7B.1C.2D.-4472cos10°-sin20°6.的值是()sin70°13A.B.C.3D.222π47π7.已知cos(α-)+sinα=3,则sin(α+)的值是()656232344A.-B.C.-D.5555sinxcosx8.f(x)=的值域为()1+sinx+cosx-2-1A.(―3―1,―1)∪(―1,3―1)B.[,―1]∪22-1(―1,)2-3-13-1-2-12-1C.(,)D.[,]22229.sin(75)cos(45)3cos(15)的值等于()A.1B.1C.1D.04m-610.等式sinα+3cosα=有意义,则m的取值范围是()4-m7777A.(-1,)B.[-1,]C.[-1,]D.[―,―1]333311、已知均为锐角,且1,1,1,则的值(),,tantantan+258A.πB.πC.πD.5π6434312.已知是锐角,sin=x,cos=y,cos()=-,则y与x的函数关系式5为()34334A.y=-1x2+x(<x<1)B.y=-1x2+x(0<x<1)5555534334C.y=-1x2-x(0<x<)D.y=-1x2-