Example

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

Question

$$(mn)^{2}+2\times mn\times1^{2}+(1^{2})^{2}$$

Evaluate

$\left(mn+1\right)^{2}$

Expand

$2mn+\left(mn\right)^{2}+1$

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