Can someone provide me with some hint how to evaluate this limit?$$\lim_{x \rightarrow 0}\left (\frac 1x- \frac 1{\sin x} \right )$$I tried l'hopital's rule but it didn't work.
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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