函数y=2sin2x+3cos2x-4的最小正周期为_.
问题描述:
函数y=2sin2x+3cos2x-4的最小正周期为______.
答
∵y=2sin2x+3cos2x-4
=y=2+cos2x-4
=
+1 2
cos2x-21 2
=
cos2x-1 2
,3 2
∴三角函数的周期T=
=π,2π 2
故答案为:π