Final Answer
$-\left(x-y+1\right)^2$
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Step-by-step Solution
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1
Calculate the numerical value for $-\left(x-y+1\right)^2$ when $yo=1$. Replace the unknowns with their corresponding values
$-\left(x-y+1\right)^2$
Final Answer
$-\left(x-y+1\right)^2$