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(√5-√3)²=5-2√15+3=8-2√15=2(4-√15)
(√3+1)²=3+2√3+1=4+2√3=2(2+√3)
(√15+3)²=15+6√15+9=24+6√15=6(4+√15)
(√7-2)²=7-4√7+4=11-4√7