Expand
1+4\left(ef\right)^{2}-4ef
Evaluate
\left(2ef-1\right)^{2}
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4e^{2}f^{2}-4ef+1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2ef-1\right)^{2}.
4e^{2}f^{2}-4ef+1
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2ef-1\right)^{2}.
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