(a+b+c)(a+b+c) - (a-b-c)(a-b-c)
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Answer:
a²+b²+c² - a²+b²+c²
= b²+b²+c²+c²
= b²+² + c²+²
=b⁴+c⁴
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(a+b+c)(a+b+c)-(a-b-c) (a-b-c)
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