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[tex] \frac{p- \sqrt{pq}+q }{ \sqrt{p}- \sqrt{q} } [/tex]
[tex] \frac{p- \sqrt{pq}+q }{ \sqrt{p}- \sqrt{q} } [/tex]
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(p-√(pq)+q) / (√p - √q) ==(p-√(pq)+q) * (√p + √q) / ( (√p - √q)* (√p + √q) ) =
=( (√p)³ + (√q)³ ) / ( p - q) =
=( √p³ + √q³ ) / ( p - q)