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A function that has a variable under a radical sign.
The diagonal of a unit square, for example, is radical(2).
When a function is nested inside another function, the outer one is the parent, the inner is the child.
No, you cannot add or subtract under the radical. The radical represents the square root function, and it only operates on the number or expression that is inside the radical. To add or subtract, you need to simplify the expressions inside the radical first.
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