12345²-12344*12346=

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12345²-12344*12346=

12345²-12344*12346=
12345²-12344*12346=

12345²-12344*12346=
12345²-12344*12346=
12345²-(12345-1)*(12345+1)
=12345²-(12345²-1)
=12345²-12345²+1
=1