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(x+y)^6/(x+y)^4-(x-y)^5/(y-x)^3
=(x+y)^(6-4)-(x-y)^5/-(x-y)^3
=(x+y)^2+(x-y)^2
=(x+y+x-y)^2-2(x+y)(x-y)
=4x^2-2(x^2-y^2)
=4x^2-2x^2+2y^2
=2x^2+2y^2
=2(x^2+y^2)
=(x+y)^(6-4)-(x-y)^5/-(x-y)^3
=(x+y)^2+(x-y)^2
=(x+y+x-y)^2-2(x+y)(x-y)
=4x^2-2(x^2-y^2)
=4x^2-2x^2+2y^2
=2x^2+2y^2
=2(x^2+y^2)
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