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(5√3 - 2√6)²
=> (5√3 - 2√6)(5√3 - 2√6)
=> 25*3 - 10*3√2 - 10*3√2 + 4*6
=> 75 + 24 - 60√2
=> 99 - 60√2
=> 3(33 - 20√2)