(a / b) % c = ((a % c) * (b^{-1} % c)) % c
How to calculate b^{-1}? I know it is not 1/b. Is there more than one way to calculate this?
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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