Prove by induction that $5^n - 1$ is divisible by $4$.
How should I use induction in this problem. Do you have any hints for solving this problem?
Thank you so much.
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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