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9y^{2}-6yz+z^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3y-z\right)^{2}.
9y^{2}-6yz+z^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3y-z\right)^{2}.