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The range of the function f(x) = log(...

The range of the function
`f(x) = log_(sqrt5)(3 + cos ((3pi)/4 + x) + cos ((pi)/4 + x) + cos ((pi)/4 - x) - cos ((3pi)/4 - x))` is :

A

`[0,2]`

B

`(0,sqrt5)`

C

`[-2,2]`

D

`[1/sqrt5,sqrt5]`

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