A:主要工业区大都集中在太平洋沿岸
B:地处环太平洋火山地震带上
C:工农业发达,农、矿产品和工业制品大量出口
D:东亚岛国,海岸线曲折
已知函数f(x)=3cos2x+2sinxcosx,x∈R.
(1)求函数f(x)的最小正周期;
(2)求函数f(x)在区间0,π4上的值域.
We were dying to hear the announcement of the winner of the race.