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If f(x) = x + tan x and f is the inverse...

If `f(x) = x + tan x` and `f` is the inverse of `g`, then `g'(x)` is equal to

A

`frac(1)(1+[g(x)-x]^2)`

B

`frac(1)(2-[g(x)-x]^2)`

C

`frac(1)(2+[g(x)-x]^2)`

D

None of these

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