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If f(x)=(x)/(x-1), then what is (f(a))/(...

If `f(x)=(x)/(x-1)`, then what is `(f(a))/(f(a+1))` equal to?

A

`f(a^(2))`

B

`f((1)/(a))`

C

f (- a)

D

`f |(-a)/(a - 1)| `

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The correct Answer is:
A
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