Question

solve x⁴-y⁴+x²-y²
factorise this sum

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Answer 1

Answer:

x⁴-y⁴+x²-y²

= (x²)²-(y²)²+x²-y²

= (x²-y²)(x²+y²)+x²-y²

= (x-y)(X+y)(x²+y²)+(x-y)(X+y)

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