Expand using identity (root2x + 2y - root3z)2
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(root2x+2y-root3z)²
=(root2x)²+(2y)²+(-root3z)²+2(root2x)(2y) +2(2y)(-root3z)
+2(root2x)(-root3z)
=2x+4y²+3z+4yroot2x-4yroot3z-2root6xz
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