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x^{2}-4xy^{3}+4\left(y^{3}\right)^{2}-\left(2y^{3}-x\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-2y^{3}\right)^{2}.
x^{2}-4xy^{3}+4y^{6}-\left(2y^{3}-x\right)^{2}
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
x^{2}-4xy^{3}+4y^{6}-\left(4\left(y^{3}\right)^{2}-4y^{3}x+x^{2}\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2y^{3}-x\right)^{2}.
x^{2}-4xy^{3}+4y^{6}-\left(4y^{6}-4y^{3}x+x^{2}\right)
To raise a power to another power, multiply the exponents. Multiply 3 and 2 to get 6.
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Combine x^{2}-4xy^{3}+4y^{6} and -\left(4y^{6}-4y^{3}x+x^{2}\right) to get 0.
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The difference of squares can be factored using the rule: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
2\left(x-2y^{3}\right)
Consider 2x-4y^{3}. Factor out 2.
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Rewrite the complete factored expression. Simplify.