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A B C 3 Formula Source(s) https//shrinkurlim/badse 0 0 DanielM Lv 4 1 decade ago This is just multiplying out and bookkeeping It's a^3 b^3 c^3 plus 3 of each term having one variable and another one squared like ab^2, b^2c, all 6 combinations of those, then plus 6abc and that's it 0 5= and so the power series expansion agrees with the Taylor series Thus a function is analytic in an open disk centred at b if and only if its Taylor series converges to the value of the function at each point of the diskLearn how to derive the expansion of $(xa)(xb)$ formula geometrically by the areas of rectangle and square in geometry Learn Proof Latest Math Topics Dec 22, Learn cosine of angle difference identity Nov 18, Learn constant property of a circle with examples Oct 21, Expanding Logarithms Chilimath (a+b)^3 formula expansion