Factorise the following
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x⁴ - y⁴ + x² - y²
solution
x⁴ + x² - y⁴ - y²
( x² - y² ) ( x² + y² + 1 )
( x - y ) ( x + y )
( x² + y² + 1 ) ( x - y ) ( x + y )
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