A:to
B:in
C:on
—I don't think so. The key to his good grades is his hard work, not good luck.
已知f(x)=sin(ωx+π3)(ω>0)的最小正周期为π.
(1)求在(0,π2)内一条对称轴;
(2)求在(0,2π内的零点.
9的因数有____个