In triangle PQR, angle 
radians and angle 
. Given that 
is sufficiently small for 
and above to be ignored, show that
Category Archives: Binomial expansion
Express 
in partial fractions and hence obtain f(x) as a series in ascending powers of x, giving the first 3 non-zero terms of this expansion. Find the coefficient of 
in the expansion.
Express 
as partial fractions and hence obtain f(x) as a series in ascending powers of x as far as the term x³. State the range of values of x for which the expansion is valid. Find the coefficient of 
in the expansion, where n>1.
