(а^2+4)^2-16a^2=a^4+8a^2+16-16a^2=a^4-8a^2+16=(a^2-4)^2
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(а^2+4)^2-16a^2=a^4+8a^2+16-16a^2=a^4-8a^2+16=(a^2-4)^2