Summation of $n^3\over(3n)!$ from 1 to infinity
Please provide procedure.
Don't know how to proceed.
Tried making it to form $n^2\over3 (3n-1)!$then?
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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