
A.-3π/2
B.0
C.2π/3
D.3π/2
[单选题]A.-3π/2B.0C.2π/3D.3π/2
[单选题]A.-3π/2B.0C.2π/3D.3π/2
[单选题]A.-3π/2B.0C.2π/3D.3π/2
[单选题]A.-3π/2B.0C.2π/3D.3π/2
[单选题]A.-3π/2B.0C.2π/3D.3π/2
[单选题]A.-3π/2B.0C.2π/3D.3π/2
[单选题]A.-3π/2B.0C.2π/3D.3π/2
[单选题]等于( ).A.不存在B.C.D.
[单选题]( )..A.B.C.D.