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Find the domain of definition of the function `f(x) = sqrt(x^(2) - 5x + 6)`.

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Given `f(x) = sqrt(x^(2) - 5x + 6)`
For f(x) to be defined, `x^(2) - 5x + 6 ge 0`
`rArr (x-3)(x-2) ge 0`
Sign scheme for `x6(2) - 5x +6`

`:. -oo lt x le 2` or `3 le x le oo`
Domain `= (-oo, 2] cup [3, oo)`
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