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f(x)=(x+1)/(x-1) f^(n+1)(x)=f(f^n(x)) th...

`f(x)=(x+1)/(x-1) f^(n+1)(x)=f(f^n(x))` the the value of `f^7(7)+f^6(6)` is equal to

A

`(7)/(6)`

B

`-(3)/(2)`

C

`(7)/(12)`

D

`-(11)/(12)`

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