If-x-4-and-higher-powers-of-x-are-neglected-show-that-1-x-1-x-x-2-1-x-1-2-x-3-

Question Number 83935 by Roland Mbunwe last updated on 08/Mar/20

I f x^{4} a n d h i g h e r p o w e r s o f x a r e n e g l e c t e d, s h o w t h a t

\sqrt{(\frac{1 - x}{1 + x + x^{2}}) = 1 - x + \frac{1}{2} x^{3}}