let-put-for-lt-1-u-n-0-pi-cos-nx-1-2-cosx-2-dx-find-u-n-interms-of-n-and-

Question Number 30548 by abdo imad last updated on 23/Feb/18

l e t p u t f o r ∣ λ ∣< 1 u_{n} = \int_{0}^{π} \frac{c o s (n x)}{1 - 2 λ c o s x + λ^{2}} d x

f i n d u_{n} i n t e r m s o f n a n d λ .