(a^2 + b^2)^2 - a^2(a^2 + b^2) = (a^2 + b^2)(a^2 + b^2 - a^2) =
= b^2(a^2 + b^2)
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(a^2 + b^2)^2 - a^2(a^2 + b^2) = (a^2 + b^2)(a^2 + b^2 - a^2) =
= b^2(a^2 + b^2)