(2m+1/2)(4m-1)(4m∧2-1/4)-4m∧2(2m+1)(2m-1)
=1/2 (4m+1)(4m-1)(4m∧2-1/4)-4m∧2(4m²-1)
=1/8 [(16m²-1)（16m²-1）]-16m^4+4m²
=32m^4-4m²+1/8-16m^4+4m²
=16m^4+1/8