Friday, 16 February 2018

elementary number theory - If $p^2,$is divisible by 3, why is p also divisible by 3?

I came across this in proving that the $\sqrt{3}$ is irrational

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real analysis - How to find $lim_{hrightarrow 0}frac{sin(ha)}{h}$

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}...