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
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 .
Expression for the Binomial expansion of is:
In the given case:
We are interested only in coefficient of terms with :
The only terms with :
Hence coefficient of is .