Question

$l4 + 4l2m2 + 4m4$
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Answer 1

We know the expansion of (a+b)^2 i.e, a^2+b^2+2ab

Applying the formula,

(l^2)^2 + 2.(l^2).(2m^2) + (2m^2)^2

=> (l^2+2m^2)^2

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