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√5 - 2 / √5 + √2 x √5 - √2 / √5 - √2 =
(√5 - 2) (√5 - √2) / 5 - 2 =
5 - √10 - 2√5 + 2√2 / 3 =
5 / 3 (-√10 -2√5 + 2√2)