∵函数 f(x)=Asin(x+ϕ)(A>0)在x=
π
4 处取最大值,
∴
π
4 +ϕ=2kπ+
π
2 ,k∈Z,
∴ϕ=2kπ+
π
4 ,k∈Z,
∴f(x)=Asin(x+2kπ+
π
4 )=Asin(x+
π
4 ),
∴f(x-
π
2 )=Asin(x-
π
4 )非奇非偶可排除A,同理可排除C,
∴f(x-
π
4 )=Asinx,为奇函数,排除B;
f(x+
π
4 )=Asin[(x+
π
4 )+
π
4 ]=Acosx,为偶函数,D正确.
故选D.
∵函数 f(x)=Asin(x+ϕ)(A>0)在x=
π
4 处取最大值,
∴
π
4 +ϕ=2kπ+
π
2 ,k∈Z,
∴ϕ=2kπ+
π
4 ,k∈Z,
∴f(x)=Asin(x+2kπ+
π
4 )=Asin(x+
π
4 ),
∴f(x-
π
2 )=Asin(x-
π
4 )非奇非偶可排除A,同理可排除C,
∴f(x-
π
4 )=Asinx,为奇函数,排除B;
f(x+
π
4 )=Asin[(x+
π
4 )+
π
4 ]=Acosx,为偶函数,D正确.
故选D.