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d/(dx)[log{e^x((x-2)/(x+2))^(3//4)}] equ...

`d/(dx)[log{e^x((x-2)/(x+2))^(3//4)}]` equals
`(a) (x^2-1)/(x^2-4)`
(b) 1
(c) `(x^2+1)/(x^2-4)`
(d) `e^x(x^2-1)/(x^2-4)`

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