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If the domain of the function f(x) = log e ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − + + 3 x x 4 3 x 2 2 + cos –1 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + − 2 x 1 x 2 is ( α , β ], then the value of 5 β – 4 α is equal to

1. 10
2. 11
3. 12
4. 9

Correct answer: 12

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