(vi) (a2 + b2) (a2 + b2) - (a2 - b2) (a2 - b2)
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Answer:
4a2b2
Step-by-step explanation:
(a2 + b2)(a2+b2) - (a2-b2)(a2-b2)
= a4 + a2b2 +a2b2 +b4 - (a4 - a2b2 -a2b2 + b4)
= a4 + a2b2 + a2b2 + b4 - a4 + a2b2 + a2b2 - b4
= 4a2b2
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