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20 13 I accepted the analysis of mathematics liberal arts in Beijing college entrance examination.
f(x)= cos2x sin2x+( 1/2)cos4x

=( 1/2)sin4x+( 1/2)cos4x

=(√2/2) sin(4x+π/4)

Minimum positive period: π/2

Maximum value: √2/2

When π/2 < x < π,

9π/4

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