(√15 - √6) (√5 - √2) (√20 - √18) ( √20 +√18)=(√75-√30-√30+√12)(20-18)=
20√75-18√75-20√30+18√30+20√12-18√12=2√75-2√30+2√12=2(√75-√30+√12)
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(√15 - √6) (√5 - √2) (√20 - √18) ( √20 +√18)=(√75-√30-√30+√12)(20-18)=
20√75-18√75-20√30+18√30+20√12-18√12=2√75-2√30+2√12=2(√75-√30+√12)