write the identities of the following a cube + b cube x+a x+b x+c
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a3+b3 = (a+b)(a2-ab+b2)
(x+a)(x+b)(x+c) = x3+(a+b+c)x2+(ab+bc+ca)x+abc
(x+a)(x+b)(x+c) = x3+(a+b+c)x2+(ab+bc+ca)x+abc
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