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

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

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

(2ab)^2*(a^2-b^2)-(2a^2b^2)^2/(4a^2)+4a^2b^4
(2ab)^2×(a^2-b^2)-(2a^2b^2)^2/(4a^2)+4a^2b^4 =4a^2b^2×(a^2-b^2)-4a^4b^4/(4a^2)+4a^2b^4 =4a^2[b^2×(a^2-b^2)-b^4]/(4a^2)+4a^2b^4 =b^2×(a^2-b^2)-b^4+4a^2b^4 =a^2b^2-b^4-b^4+4a^2b^4 =a^2b^2-2b^4+4a^2b^4