2a²b²+2b²c²+2c²a²-a⁴-b⁴-c⁴ factorise
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a^4-b^4-c^4+2a^2b^2+2b^2c^2+2c^2a^2
=a⁴-b⁴-c⁴+2(a²b²+b²c²+c²a²)
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