Subtract a^2-b^2 from 9a^2-3b^2-2ab
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Answer:
9a²-3b²-2ab - (a²-b²)
= 9a²-3b²-2ab -a²+b²
= 9a²-a²-3b²+b²-2ab
=8a²-2b²-2ab..ans
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