Solution:
We can write,
We know,
On differentiating Eq. (ii) w.r.t. x, we get
On putting x = 1 in Eqs. (ii) and (iii), we get
and
from eq.(i)
upto (n+1) term
if a and d, are two complex numbers, then the sum to (n+ 1) terms of the following series
We can write,
We know,
On differentiating Eq. (ii) w.r.t. x, we get
On putting x = 1 in Eqs. (ii) and (iii), we get
and
from eq.(i)
upto (n+1) term