(5-root2)(root5+2)
=(a-b)(c+d)
=ac+ad-bc-bd=
5 root5 +10 -root10 -2root2
=5root5 -2root2 - root 10 +10
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(5-root2)(root5+2)
(5-root2)(root5+2)
=(a-b)(c+d)
=ac+ad-bc-bd=
5 root5 +10 -root10 -2root2
=5root5 -2root2 - root 10 +10