If the maximum and the minimum values of ∣∣ ∣ ∣∣1+sin2xcos2x4sin2xsin2x1+cos2x4sin2xsin2xcos2x1+4sin2x∣∣ ∣ ∣∣ are M and m respectively, then Mm is
If f(x)=1+cos2x+8sin2xsin 2x. Then the minimum value of f(x) is