Question

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A) (x-y)(x+y)(x^2+y^2)

Б) (a-1)(a+1)(a^2+1)

Answer 1

(x-y)(x+y)(x^2+y^2)=(x²-y²)(x²+y²)=x^4-y^4
 (a-1)(a+1)(a^2+1)=(a²-1²)(a²+1)=a^4-1