(a+2b)^2+(a-2b)^2=2(a²+4b^2)
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Step-by-step explanation:
LHS=(a+2b)²+(a-2b)²
=a²+4b²+4ab+a²+4b²-4ab
=a²+a²+4b²+4b²
=2(a²+4b²)
=LHS
proved
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