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\left(1-y\right)^{2}
Multiply 1-y and 1-y to get \left(1-y\right)^{2}.
1-2y+y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(1-y\right)^{2}.
\left(1-y\right)^{2}
Multiply 1-y and 1-y to get \left(1-y\right)^{2}.
1-2y+y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(1-y\right)^{2}.