factorise a⁴+2a²b²+b⁴=
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) a⁴+a²b²+b⁴
= (a² +b²)² - 2a²b² + a²b²
= (a²+b²)² - a²b²
= (a²+b²)² - (ab)²
now it is in the form of a² - b² =( a+ b)(a-b)
(a²+b²+ab)(a²+b² - ab)
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