Example

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

Question

$$(x+y)^{4}-(x-y)^{4}$$

Evaluate

$8xy\left(x^{2}+y^{2}\right)$

Expand

$8xy^{3}+8yx^{3}$

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