$$1+ \frac12 + \frac14+\dots+\frac1{2^n}$$
To find the sum of the equation you have to find $n$, the number of terms in the geometric sequence and I don't know how...
The answer in the text book is $2-\frac1{2^n}$.
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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