①存在实数x,使sinx+cosx=;

②若α、β是第一象限角，且α＞β，则tanα＞tanβ;

③函数y=cos(+)是奇函数；

④函数y=sin2x的图象向左平移个单位，得到y=sin(2x+)的图象；

⑤在△ABC中，A＞BsinA＞sinB.

其中正确的命题的序号是____________.

A.-               B.                 C.-               D.

A.2π               B.π                     C.               D.

A.有最大值而无最小值                        B.有最小值而无最大值

C.有最大值且有最小值                        D.既无最大值又无最小值

A.-1                    B.                    C.-              D.-5

A.ω=1，φ=                                    B.ω=1，φ=-

C.ω=，φ=                                  D.ω=，φ=-

A.y=2sin(+)                          B.y=2sin(-)

C.y=sin(2x+)                           D.y=sin(2x-)