Geometric sequence has first term $a$ and last term $l$ and the sum of all these terms is $S$. Prove that the common ratio of the sequence is $\frac{S-a}{S-l}$.
How to include the answer with $S$?
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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