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Let ƒ(x) = x 5 + 2e x/4 for all x ∈ R. Consider a function g(x) such that (gof) (x) = x for all x ∈ R. Then the value of 8g ′

1. is :
2. 16
3. 4
4. 8 (4) 2

Correct answer: is :

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