It seems

lim x -> +oo

sum( (-1)^i * x^(2*i-1)/( factorial(2*i)*ln(2*i) ) , i = 1 .. oo)

+(1/2)*Pi = 0

or in tex

how to prove it ?

regards

tommy1729

lim x -> +oo

sum( (-1)^i * x^(2*i-1)/( factorial(2*i)*ln(2*i) ) , i = 1 .. oo)

+(1/2)*Pi = 0

or in tex

how to prove it ?

regards

tommy1729