Factor the following polynomial completely.

-x^2 y^2 + x^4 + 4y^2 - 4x^2

A) (x - 2) (x - 2) (x + y) (x - y)

B) (x + 2) (x + 2) (x + y) (x - y)

C) (x + 2) (x - 2) (x + y) (x - y

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The intersection of two planes that do not coincide is a

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