(2m^2n+1)(-2m^2n+1)+4(m^4n^2+1)
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(2m^2n+1)(-2m^2n+1)+4(m^4n^2+1)(2m^2n+1)(-2m^2n+1)+4(m^4n^2+1)(2m^2n+1)(-2m^2n+1)+4(m^4n^2+1)(2m^2n+
(2m^2n+1)(-2m^2n+1)+4(m^4n^2+1)
(2m^2n+1)(-2m^2n+1)+4(m^4n^2+1)
(2m^2n+1)(-2m^2n+1)+4(m^4n^2+1)
(2m^2n+1)(-2m^2n+1)+4(m^4n^2+1)
=（1-4m^4n^2）+4m^4n^2+4
=1+4
=5
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