A.y=sin(
+
) B.y=sin(2x+
)
C.y=sin(2x-
) D.y=sin(2x-
)
A.y=sin(
+
) B.y=sin(2x+
)
C.y=sin(2x-
) D.y=sin(2x-
)
解析
:对于A,T=对于B,T=
=π,令2x+
=kπ+
,
∴2x=kπ+
.
∴x=
+
(k∈Z
对于C,T=
=π,令2x-
=kπ+
,
∴2x=kπ+
.
∴x=
+
(k∈Z
对于D,T=
=π,令2x-
=kπ+
,
∴2x=kπ+
.
∴x=
+
(k∈Z
令k=0,得x=
.∴选D.
答案
:D