Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$(m+n)^{4}-(m-n)^{4}$$

Evaluate

$8mn\left(m^{2}+n^{2}\right)$

Expand

$8mn^{3}+8nm^{3}$

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