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The range of a R for which the function ...

The range of a R for which the function
`f (x) = (4a -3) (x + log _(e) 5) + 2 (a -7) cot ((x)/(2)) sin ^(2) ((x)/(2)), x ne 2 npi, n in N` has critical points, is :

A

`[1, oo)`

B

`[- (4)/(3), 2]`

C

`(-3, 1)`

D

`(-oo, -1]`

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