(2·a^2 - 5·b^2)·(2·a^2 + 5·b^2) + (a^2 + 4·b^2)^2 - (- 2·a)·(- 4·a·b^2) =
=(4·a^4 - 25·b^4) + (a^4 + 8·a^2·b^2 + 16·b^4) - 8·a^2·b^2 =
=5·a^4 - 9·b^4
4a^4-25b^4+(a^4+16b^4+8a^2b^2)-8a^2b^2 =
= 5a^4-9b^4
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