When I try to graph this formula, $$y=\sum^x_{n=1}[n*\sum^n_{m=1}\sin(\frac{m}{n})]$$, the graph shows nothing.
I thought it is possible that I input it in wrongly or the software can't solve this kind of summation equation but when I try with other equation like this, $$y=\sum^x_{n=1}[n*\sum^n_{m=1}(\frac{m}{n})]$$, the software is able to graph it.
Why is it unable to solve my first equation?