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Consider the function f(x)=2sin^(2)x-(1)...

Consider the function `f(x)=2sin^(2)x-(1)/(2),AA x in R` ,then the complete range of `f(x)` is:
A) `[-2 , 2]`
B) `[-1/2 , 3/2]`
C) `[0 , 3/2]`
D) `[-1/2 , 2]`

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