(2x^3y)^2.(-2xy)(4a^2bx^3)^2-(-a^4)(3b)^2(2x^3)^2
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(2x^3y)^2.(-2xy)(4a^2bx^3)^2-(-a^4)(3b)^2(2x^3)^2
(2x^3y)^2.(-2xy)
(4a^2bx^3)^2-(-a^4)(3b)^2(2x^3)^2
(2x^3y)^2.(-2xy)(4a^2bx^3)^2-(-a^4)(3b)^2(2x^3)^2
(2x^3y)^2.(-2xy)
=-8x^7y^3
(4a^2bx^3)^2-(-a^4)(3b)^2(2x^3)^2
=16a^4b^2x^6+36a^4b^2x^6
=52a^4b^2x^6
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