(a + b + 2c)(a2 + b2 + 4c2 - ab - 2bc - 2ca) విలువ ఎంత?

1
a3 - b3 - c3 - 6abc
2
a3 + b3 + c3 - 6abc
3
a3 - b3 - 8c3 - 3abc
4
a3 + b3 + 8c3 - 6abc

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