In Exercises 1940, expand the product. Use
Chapter 0, Problem A.1.121(choose chapter or problem)
In Exercises 19–40, expand the product. Use vertical alignment in Exercises 33 and 34.
\(\left(x^{1 / 2}-y^{1 / 2}\right)\left(x^{1 / 2}+y^{1 / 2}\right)\)
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