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Prove that [[a^2,bc,c^2+ca],[a^2+ab,b^2,...

Prove that `[[a^2,bc,c^2+ca],[a^2+ab,b^2,ca],[ab,b^2+bc,c^2]]= 4a^2b^2c^2`.

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|{:(" "a^2," "bc,c^2+ca),(a^2+ab," "b^2," "ca),(" "ab,b^2+bc," "c^2):}|=4a^2b^2c^2

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