If $\theta$ is an angle lying between $90^{\circ}$ and $180^{\circ}$ and $\cos(\theta) = - \frac{4}{5}$, why does this mean that $\sin(\theta) = \frac{3}{5}$?
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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