Is even, that is, negative even,
m^2-2m-3=(m- 1)^2-4≥-4
So-4 ≤ m 2-2m-3
When m 2-2m-3 =-4, = = & gtm= 1
When m 2-2m-3 =-2, = = & gtm= 1 √2.
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