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(x+2y)^2(x-2y)^2-(2x+y)^2(2x-y)^2
=(x^2-4y^2)^2-(4x^2-y^2)^2
=(x^2-4y^2+4x^2-y^2)(x^2-4y^2-4x^2+y^2)
=-(5x^2-5y^2)(3x^2+3y^2)
=-15(x^2-y^2)(x^2+y^2)
=-15(x-y)(x+y)(x^2+y^2)
=(x^2-4y^2)^2-(4x^2-y^2)^2
=(x^2-4y^2+4x^2-y^2)(x^2-4y^2-4x^2+y^2)
=-(5x^2-5y^2)(3x^2+3y^2)
=-15(x^2-y^2)(x^2+y^2)
=-15(x-y)(x+y)(x^2+y^2)
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(x+2y)^2(x-2y)^2
=x^2-4y^2
(2x+y)^2(2x-y)^2
=4x^2-y^2
x^2-4y^2-4x^2+y^2
=-3(x^2+y^2)
=x^2-4y^2
(2x+y)^2(2x-y)^2
=4x^2-y^2
x^2-4y^2-4x^2+y^2
=-3(x^2+y^2)
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=[(X+2Y)(X-2Y)]^2-[(2X+Y)(2X-Y)]^2
=(X^2-4Y^2)^2-(4X^2-Y^2)^2
=(X^2-4Y^2-4X^2+Y^2)(X^2-4Y^2+4X^2-Y^2)
=-15(X^2+Y^2)(X^2-Y^2)
=-15(X^2+Y^2)(X-Y)(X+Y)
=(X^2-4Y^2)^2-(4X^2-Y^2)^2
=(X^2-4Y^2-4X^2+Y^2)(X^2-4Y^2+4X^2-Y^2)
=-15(X^2+Y^2)(X^2-Y^2)
=-15(X^2+Y^2)(X-Y)(X+Y)
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