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Let f: R rarr R be defined as f(x)=2 x^3...

Let `f: R rarr R` be defined as `f(x)=2 x^3+7 x-5` and `g(x)=f^-1(x)`. If `g^prime(4)=a/b` where `a` and `b` are relatively prime positive integers then `(a+b)` is equal to

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