factorize using suitable identities m⁴ + 2m²n² + n⁴
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m⁴+2m²n²+n⁴
m²×²+2m²n²+n²×²
(m²)²+2m²n²+(n²)²
:•(a+b)²=a²+2ab+b²
(m²+n²)²
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