Does the concept of modular multiplicative inverse require a proof or is it taken as a definition?
Suppose $5/4 \equiv 3$ (mod $7$).
Can that even be written in the standard $a = bq + r$ notation and proven from there?
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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