Compute the domain of the real-valued function $f(x) = \sqrt{1 + \sqrt{2 - \sqrt{x}}}$.
Compute the domain of the real-valued function \( f(x) = \sqrt{1 + \sqrt{2 - \sqrt{x}}}.\)
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\(\mathbb D = \mathbb R|\ 0\ge x\ge4\)
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