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2yx-4y^{2}+\left(x+1\right)\left(x-1\right)
Use the distributive property to multiply 2y by x-2y.
2yx-4y^{2}+x^{2}-1^{2}
Consider \left(x+1\right)\left(x-1\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
2yx-4y^{2}+x^{2}-1
Calculate 1 to the power of 2 and get 1.
2yx-4y^{2}+\left(x+1\right)\left(x-1\right)
Use the distributive property to multiply 2y by x-2y.
2yx-4y^{2}+x^{2}-1^{2}
Consider \left(x+1\right)\left(x-1\right). Multiplication can be transformed into difference of squares using the rule: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
2yx-4y^{2}+x^{2}-1
Calculate 1 to the power of 2 and get 1.