evaluate using formula (2002)²
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(2000)²
(2000)²= (1990+10)²
(2000)²= (1990+10)²= (1990)² + 2×1990×10 +(10)² [Applying the formula (a+b)², where a= 1990 and b= 10]
=3960100 + 39800 + 100
=4000000
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