Evaluate
\left(2-c-b\right)^{2}
Expand
b^{2}+2bc-4b+c^{2}-4c+4
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b^{2}+2bc-4b+c^{2}-4c+4
Square 2-b-c.
b^{2}+2bc-4b+c^{2}-4c+4
Square 2-b-c.
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