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Let f : R → R be a function defined by f(x) = 4 / 1 4 ) x 1 ( x + , and g(x) = f(f(f(f(x))))). Then ∫ 5 2 0 2 x 18 g(x)dx is equal to

1. 33
2. 39
3. 36
4. 42

Correct answer: 39

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