Question

expand using standard formula​

Answer 1

Answer:

we know that

$(x + y)(x - y) = x {}^{2} - y {}^{2}$

solution

$(x + y)(x - y)(x {}^{2} + y {}^{2} )$

$= (x {}^{2} - y {}^{2} )(x {}^{2} + y {}^{2} )$

$= (x {}^{4} - y {}^{4} )$

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Answer 2

hope its help

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