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Expand the following :
 
i. \((4a – b + 2c)^2=\) ia2+ib2+ic2+iab+ibc+iac
 
ii. \((3a – 5b – c)^2=\) ia2+ib2+ic2+iab+ibc+iac
 
iii. \((– x + 2y – 3z)^2=\) ia2+ib2+ic2+iab+ibc+iac