Simplify each of the following expressions :
(i) (x+y+z)2+
(ii) (x+y-2z)2-x2 – y2 - 3z2+4xy
(iii) (x2 – x + 1)2 - (x2 + x + 1)2
(i) Using identity,
(ii) Using the identity,
(iii) Using the identity,