A.0              B.1              C.2               D.3

A?α＜β＜γ                                B?α＞β＞γ

C?β＜α＜γ                                D?β＞α＞γ

A.arctan８                               B.arctan８-π

C.π-arctan８                             D.π＋arctan８

A?arcsin()=arccos

B?arccos()=arcsin

C?arctan(-1)=arcsin(-1)

D?arcsin()+arccos=0

A.方程sinx=的解是±arcsin

B.方程cosx=的解是±arccos

C.方程tanx=的解是±arctan

D.cos(arccos)的值是

A.若点P(a,2a)(a≠0)为角α终边上一点,则sinα=

B.同时满足sinα=,cosα=的角α有且只有一个

C.当|a|＜1时,tan(arcsina)的值恒正

D.三角方程tan(x+)=的解集为{x|x=kπ,k∈Z}

A.{}                                   B.{x|x=2kπ+,k∈Z}

C.{,π}                            D.{x|x=kπ+,k∈Z}