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Expand each of the following , using sui...

Expand each of the following , using suitable identities :
(i) `(x+2y+4z)^2`
(ii) `(2x-y+z)^2`
(iii) `(-2x+3y+2z)^2`
(iv) `(3a-7b-c)^2`
(v) `(-2x+5y-3z)^2`
(vi) `(1/4a-1/2b+1)^2`

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