How would you evaluate the sum of this series
Sinx*sec3x + sin3x*sec3^2(x) + sin3^2(x)*sec3^3(x) + ... upto n terms.
I can tell it is a telescoping series but I am not able to get that one step that will cancel all terms
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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