A.            B.                 C.0               D.

A.［-3，0）                             B.（0，3］

C.［-3，3］                             D.（2kπ,2kπ+π）(k∈Z)

A.                B.              C.π                D.

A.y=sinx            B.y=cosx           C.y=sin2x           D.y=cos2x

A.sin()＜sin()              B.sin()＜sin()

C.sin3＞sin2                              D.sinπ＞sin(π)

A.y=3,x=                               B.y=1,x=+2kπ(k∈Z)

C.y=3,x=-+2kπ(k∈Z)             D.y=3,x=+2kπ(k∈Z)

①y=sinx的递增区间是［2kπ,2kπ+］(k∈Z)  ②y=sinx在第一象限是增函数  ③y=sinx在［-，］上是增函数

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