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A value of α such that ∫ + α α + α + α + 1 ) 1 x )( x ( dx = log e ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 8 9 is :

1. 2
2. –2
3. 2 1
4. 2 1 –

Correct answer: –2

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