simplify: [5+√7][2+√5]-[√3+√7]^2
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(5+√7)(2+√5)-(√3+√7)²
10+5√5+2√7+√35-(3+7+2√21)
10+-3-7-√21+5√5+2√7+√35
√35+2√7+5√5-√21
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