http://i49.tinypic.com/hur98w.jpg

i found the series of the given function

and i need to find the value of

$\displaystyle

\sum_{n=1}^{\infty}\frac{\sin (n)}{n}

$

so i used derechlet

$\displaystyle

f(0)=\frac{h^2}{\pi}(\pi-h)-\sum_{n=1}^{\infty}\frac{h^2}{\pi}\frac{sin(hn)}{n }

$

but on x=0 f(0) could be 0 or $\displaystyle h^2$ so i don know what to put instead of f(0)

and i dont how to decide what value to put instead of h