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Let f, g: (0, ∞ ) → R be two functions defined by f(x) = 2 x 2 t x (| t | t )e dt − − − ∫ and g(x) ∫ − 2 x 0 t 2 / 1 dt e t . Then, the value of 9 ( ) ( ) ( ) e e f log 9 g log 9 + is equal to

1. 10
2. 9
3. 6
4. 8

Correct answer: 8

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