(2ab)^2*(a^2-b^2)-(2a^2b^2)^2/(4b^2)+4a^2b^4

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(2ab)^2*(a^2-b^2)-(2a^2b^2)^2/(4b^2)+4a^2b^4
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(2ab)^2*(a^2-b^2)-(2a^2b^2)^2/(4b^2)+4a^2b^4
(2ab)^2*(a^2-b^2)-(2a^2b^2)^2/(4b^2)+4a^2b^4

(2ab)^2*(a^2-b^2)-(2a^2b^2)^2/(4b^2)+4a^2b^4
(2ab)²×(a²-b²)-(2a²b²)²/(4b²)+4a²b⁴
=4a²b²×(a²-b²)-4a⁴b⁴/(4b²)+4a²b⁴
=4a⁴b²-4a²b⁴-a⁴b²+4a²b⁴
=3a⁴b²