化简:(a+2)2﹣(a﹣2)2=( )
A:2
B:4
C:8a
D:2a2+2
— Yes. He never praised him ________ he became one of the top students in his grade.
函数f(x)=Asin(ωx+φ)+k(A>0,ω>0,|φ<π2)的图象如图所示.
(1)直接写出f(x)表达式;
(2)将f(x)图象上所有点纵坐标不变,横坐标缩短为原来的23,然后再向右平移π4得到g(x)图象,求g(x)的单调区间.