(a-b-c)²+(a+b-c)².
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refer to above attachment
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(a-b-c)²+(a+b-c)²
=a²+b²+c²-2ab+2bc-2ac+a²+b²+c²+2ab-2bc-2ac
=a²+a²+b²+b²+c²+c²-2ab+2ab+2bc-2bc-2ac-2ac
=2a²+2b²+2c²-4ac
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