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Let the domains of the functions f(x) = log 4 log 3 log 7 (8 – log 2 (x 2 + 4x + 5)) and g(x) = sin – 1 7x 10 x 2         be (  ,  ) and [  ,  ], respectively. Then  2 +  2 +  2 +  2 is equal to:

1. 14
2. 16
3. 13
4. 15

Correct answer: 15

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