I know that $\sin(ix) = \sinh(x)$ based on manipulation of Euler's rule. However if I introduce a constant $a$, is this relation correct?
$\sin(iax)=i\sin(ax)$
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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