Factorise 2a²+4b²+3V²+4√2ab-4√3bc-2√6ca
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(a+b+c) ²=a²+b²+c²+2ab+2bc+2ca
2a²+4b²+3c²+ 4root2ab-4root3bc-2root6ac
(root2a+2b-root3)²
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