= (radical number 3)/4sin2x+1/4cos2x-3/4 =1/2 ((radical number 3)/2sin2x+1/2cos2x)-3/4 =1/.
So the minimum positive period T=2π/2=π.
(2) Because -π/6
So -π/3
Draw the image of Sinks,
So the minimum value =- 1, and the maximum value =- 1/4.
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