Show that, for $a$ and $b$ integers, it has been $3|a^{2}+b^{2}$ then $3|a$ and $3|b$.
I tried immediately, assuming that 3 divides the sum, then it has to divide separately.
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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