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The domain of the function f(x) = ) 2 x 3 x ( log 9 x 6 x 5 x cos 2 e 2 2 1 – + − ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − + − is -

1. ) , 2 ( ) 1 , (– ∞ ∪ ∞
2. ) , 2 ( ∞
3. ) , 2 ( 1 , 2 1 ∞ ∪ ⎟ ⎠ ⎞ ⎢ ⎣ ⎡ −
4. ⎪ ⎭ ⎪ ⎬ ⎫ ⎪ ⎩ ⎪ ⎨ ⎧ − + ∞ ∪ ⎟ ⎠ ⎞ ⎢ ⎣ ⎡ − 2 5 3 , 5 5 3 – ) , 2 ( 1 , 2 1

Correct answer: ⎪ ⎭ ⎪ ⎬ ⎫ ⎪ ⎩ ⎪ ⎨ ⎧ − + ∞ ∪ ⎟ ⎠ ⎞ ⎢ ⎣ ⎡ − 2 5 3 , 5 5 3 – ) , 2 ( 1 , 2 1

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