using identies spuare of ( 3x - y - 2z)
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Answer:
(a - b - c)²
= (a - b - c)(a - b - c)
= a² - ab - ac - ab + b² + bc - ac + bc + c²
= a² + b² + c² - 2ab + 2bc - 2ac
Just apply this and get answer
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