Prove that $n^3 − 4n$ is divisible by $3$ for every positive integer $n$.
I am not sure how to start this problem. Any help would be appreciated
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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