real analysis - How to find $lim_{hrightarrow 0}frac{sin(ha)}{h}$

How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule?

I know when I use lhopital I easy get

$$\lim_{h\rightarrow 0}\frac{\cos(ah)a}{1} = a$$ but I don't know how to behave without that way

Answer

Hint:

$$\frac{\sin(ha)}{h} = a\cdot\frac{\sin(ha)}{ha}$$

Also, remember what

$$\lim_{x\to 0}\frac{\sin(x)}{x}$$ is equal to?