please-prove-it-cosx-J-0-x-2-x-1-1-x-J-2x-x-

Question Number 97490 by ali_golmakani last updated on 08/Jun/20

p l e a s e p r o v e i t

\cos x = J_{0} (x) + 2 \sum_{x - 1} {(- 1)}^{x} J_{2 x} (x)

Answered by smridha last updated on 08/Jun/20

I t h i n k i t i s n e e d e d t o c h e c k y o u r

q u e s t i o n

\sum_{x - 1} {(- 1)}^{x} J_{2 x} (x) w h a t d o e s i t m e a n ?

I t h i n k J_{2 n} (x) B e s s e l f^{n} .

Commented by ali_golmakani last updated on 08/Jun/20

y e s