a-b)(a+b)(a^2+b^2)=a^4-b^4 =(a-b)(a+b)=a^2-b^2=(a^2-b^2)(a^2+b^2)=a^4-b^4=a^4-b^4=a^4-b^4:
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a-b)(a+b)(a^2+b^2)=a^4-b^4 =(a-b)(a+b)=a^2-b^2=(a^2-b^2)(a^2+b^2)=a^4-b^4=a^4-b^4=a^4-b^4: