[(1/2x-y)^2+(1/2x+y)^2](1/2x^2-2y^2)

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[(1/2x-y)^2+(1/2x+y)^2](1/2x^2-2y^2)[(1/2x-y)^2+(1/2x+y)^2](1/2x^2-2y^2)[(1/2x-y)^2+(1/2x+y)^2](1/2x

[(1/2x-y)^2+(1/2x+y)^2](1/2x^2-2y^2)
[(1/2x-y)^2+(1/2x+y)^2](1/2x^2-2y^2)

[(1/2x-y)^2+(1/2x+y)^2](1/2x^2-2y^2)
原式=(1/4x²+xy+y²+1/4x²-xy+y²)(1/2x²-2y²)
=(1/2x²+2y²)(1/2x²-2y²)
=1/4x^4-y^4
=4-1
=3