Inside Collection (Course): "Rational"ity

Summary: Finding the domain of various algebraic functions

When finding domain consider the following:

- In rational functions, the denominator cannot equal 0
- When even-degreed roots are in the numerator, the expression under the radical must be greater than or equal to 0
- When even-degreed roots are in the denominator, the expression under the radical must be greater than 0

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