$$0 < \cos (\theta)<\frac {\sin (\theta)}{\theta}<\frac {1}{\cos(\theta)} $$for $\theta\in(0,\pi/2)$.
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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