How do we evaluate the sum:
\begin{equation*}1+2+...+n\end{equation*}
I don't need the proof with the mathematical induction, but the technique to evaluate this series.
How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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