(x+y)(x-y) (x²+ y²)
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Step-by-step explanation:
the first in the form of (a+b) (a-b) = (a²-b²)
= (x²-y) ²(x²+y²)
again it is the form of (a+b) (a-b)
= (x²)^²-(y)²^²
= x⁴-y⁴
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