How I find the sum of this series ? -LSB- math -RSB- \ displaystyle \ sum _ -LCB- k = 1 -RCB- ^ -LCB- \ infty -RCB- \ frac 1 k \ ln -LRB- \ frac 1 k + 1 -RRB- -LSB- / math -RSB-
How do you find the sum of series -LSB- math -RSB- \ sum \ limits _ -LCB- n = 1 -RCB- ^ -LCB- \ infty -RCB- \ frac -LCB- 1 -RCB- -LCB- 4n ^ 2-1 -RCB- -LSB- / math -RSB- ?