if $f$ is differentiable on $(a,b)$ can we say that $f'$ is continuous on $(a,b)$?
I tried some functions and it seems that we can say so but I'm not sure.
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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