The binomial theorem may, for instance, be stated for (x+a)n alone; the formula for (x-a) being obtained by writing it as {x+(-)a} n or Ix+(- a) } n, so that (x-a) n =x- 1)xn-laF...+(-)rn(r)xn-rar+..., where + (-) r means - or + according as r is odd or even.
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