$[4(x-1/2y)(x+1/2y)]^2-(2x-3y)^2(2x+3y)^2-16y^2(2x-y)(2x+y)+(-4y^2)^2$

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$[(3ab)^3-(-5ab)^2xxab-(2+ab)^7:(8a^2b^2)^2]:(-3/4a^3b^2)^3$

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$[(1/2ab-(1/4a+b)^2+(b+1/4a)(-1/4a+b)]a+(b+1/2a)^3-b^2(3/2a+b)$

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$[(1/2x+2/3y+z)^2-(1/2+2/3y-z)^2+1/3yz]^2-3yz^2(4x+3y)$

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$[(-ab^2)^2+1/3a^2b^4]:(ab^2)^2-(1/2a^2b)^2:[(3/4ab)^2(-a)^2]$

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${[(-1/4a^2b^4)^2-(+1/2ab^2)^4-(-ab^2)^4]:(1/2a^2b)^2}^2:(2b)^3$

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${[-12/5a^2b^2xx(-25/6a^3b^3)]:(5ab)^2}:[2/5xx(ab)^6:a^3b^3]$

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$[-x^3y^3+(1/2xy)^3-4x^2yxx(1/4xy^2)]:[5xx1/2xyxx(-xy)^2]$

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$[2xy(-1/4x^2y)-(2x^2y)^3:(8x^3y)]:(1/4x^2+1/2x^2)$

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$[(1/4ab^2)^3:(1/8a^2b^2]^2:[(1/2a^4b^3):(2/5a^2b)]$

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