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Is there any identity to find the square of 998^2

It can be solved like-
(1000 - 2)^2
1000000 + 4 -2.1000.2
1000000 + 4 - 4000
996004
 
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the best route is (1000 - 2)2 = 1000000 + 4 - 2*1000*2 = 1000004 - 4000 = 9960004
 
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