问题 填空题

函数f(x)=sin2x(cos2x+sin2x)的最小正周期是______.

答案

sin2x(cos2x+sin2x)

=sin2xcos2x+sin22x

=

1
2
sin4x+
1-cos4x
2

=

2
2
sin(4x-
π
4
)+
1
2

∵ω=4,∴T=

4
=
π
2

故答案为:

π
2

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