# Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2007 | Oct-Nov | (P1-9709/01) | Q#3

Question i.       Find the first three terms in the expansion of in ascending powers of .    ii.       Use the substitution in your answer to part (i) to find the coefficient of  in the expansion of . Solution i.   Expression for the Binomial expansion of  is: In the given case: Hence; ii.   Substituting  in  Gives us We are interested only in […]