a²+b²+2ab, 2bc+c² +2bc, -4c² -a² +2ac
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************************************************
( -a +b + c )² = (-a)² + b² + c² + 2-(a)×b + 2bc + 2 -a×c)
=> (- a + b + c )² = a² + b² + c² - 2ab + 2bc - 2ac
*************************************************
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