Determine the sum of
$$\sum_n^\infty \frac{k}{3^k}$$
Can someone teach me how to solve this please thanks.
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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