— What are you doing there?
— I am ________. Breakfast is OK soon.
A:running
B:singing
C:sleeping
D:cooking
已知函数f(x)=2sin(12x-π4)(x∈R)则f(x)的最小正周期为:( )
(甲)以A为圆心,AC长为半径画弧交AB于P点,则P即为所求;
(乙)作过B点且与AB垂直的直线l,作过C点且与AC垂直的直线,交l于P点,则P即为所求对于甲、乙两人的作法,下列叙述何者正确?( )