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(√x - √y)
(√x + √y) (√x + √y)
------------- x --------------
(√x - √y) (√x + √y)
(√x + √y)(√x + √y)
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(√x - √y)(√x + √y)
(√x)² + (√x)(√y) + (√y)(√x) + (√y)²
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(√x)² + (√x)(√y) - (√y)(√x) - (√y)²
x + 2(√xy) + y
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x - y