Expand
n^{2}-2hn+h^{2}-1
Evaluate
\left(h-n\right)^{2}-1
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h^{2}-2hn+n^{2}-1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(h-n\right)^{2}.
h^{2}-2hn+n^{2}-1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(h-n\right)^{2}.
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