(x³-2y²)(-2y²-x³)=?

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(x³-2y²)(-2y²-x³)=?
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(x³-2y²)(-2y²-x³)=?
(x³-2y²)(-2y²-x³)=?

(x³-2y²)(-2y²-x³)=?
(x³-2y²)(-2y²-x³)
=-(x³-2y²)(2y²+x³)
=-x^6+4y^4