Using identities evaluate (5absquare - 2)square
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(a-b)²=a²-2ab+b²
(5ab-2)²= (5ab)²-2(5ab-2)+b²
=25a²b² - 6ab + b²
(5ab-2)²= (5ab)²-2(5ab-2)+b²
=25a²b² - 6ab + b²
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