Recent content by ahmadmath

I think it is so hard to do that in this manner because it is so hard to predict which terms should be positive or negative

thanks but I am not sure what you mean

I had tried but it doesnot work it works just when there are no absolute values

I cannot figure out the sum of this finite series: |ysin(x)|+|y2sin(2x)|+...+|ynsin(nx)| where y is real. so I want to listen any opinion may help me>