2 x y ( 2 x ^ { 2 } - 3 x y + y ^ { 2 } ) ^ { 2 } - ( x ^ { 2 } + y ^ { 2 } ) ( 2 x - y ) ^ { 2 } + 8 x ^ { 2 } y ( x - y ) | - ( 1 + 2 x y ^ { 2 } ) ( 1 - 2 x y ^ { 2 } )
Evaluate
8y\left(x-y\right)x^{2}|1-4x^{2}y^{4}|+2xy\left(\left(x-y\right)\left(2x-y\right)\right)^{2}-\left(2x-y\right)^{2}\left(x^{2}+y^{2}\right)
Differentiate w.r.t. x
2\left(-32\left(x-y\right)x^{3}y^{5}sign(1-4x^{2}y^{4})+8xy\left(x-y\right)|1-4x^{2}y^{4}|+4yx^{2}|1-4x^{2}y^{4}|+39x^{2}y^{3}-48y^{2}x^{3}+20yx^{4}-12xy^{4}+y^{5}+6yx^{2}-5xy^{2}+2y^{3}-8x^{3}\right)
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