using identities evaluate 998 square
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998
1000-2
a^2 + b^2 - 2ab
1000^2 + 2^2 - 2 (1000)(2)
1000000 + 4 - 4000
9,96,004
1000-2
a^2 + b^2 - 2ab
1000^2 + 2^2 - 2 (1000)(2)
1000000 + 4 - 4000
9,96,004
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