Question

expand using standard formula​

Answer 1

Answer:

${x}^{4} - {y}^{4}$

hope it helps.............

Answer 2

Answer:

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

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

= x^4 - y^4

hope you understand....

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