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Find the domain of definition of the function `f(x) = sqrt(a^(2) - x^(2)), a gt 0`.

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Given that `f(x) = sqrt(a^(2) - x^(2)), a gt 0`
`a^(2) - x^(2) ge 0`
`rArr a^(2) ge x^(2)`
Sign scheme for `a^(2) - x^(2)`

`:.` Domain = [-a, a]
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