factorise 4x2+y2+z2-4xy-2yz+4xz
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(2x-y+z)^2
As (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca
As (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca
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