- We usually eat dinner at 10 p.m.
- Wow! _________.( )
A:That's too late!
B:I'm sorry.
C:That's great!
D:Good idea!
在平面直角坐标系中,已知直线y=- 34 x+3与x轴、y轴分别交于A、B两点,点C(0,n)是y轴上一点,把坐标平面沿直线AC折叠,使点B刚好落在x轴上,则点C的坐标是( )
函数y=sin4x-cos4x(x∈R)的最小正周期为( )