In trig, usually 0 to 2pi but it can be anything.
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The domain and range can be the whole of the real numbers, or some subsets of these sets.
If a quadratic function is 0 for any value of the variable, then that value is a solution.
The domain is from negative infinity to positive infinity. The range is from positive 2 to positive infinity.
A quadratic function will have a degree of two.
There are two sets for any given function, the domain and the range. The range is the set of outputs and the set of inputs is the domain.