Arctan(x) and the improper integral of Sin(x)/x

http://www.avidsynergy.com/pdf/Sin_mx_over_x_Exp_minus_ax_integral.pdf

Sum of Cosines Integration (original presentation)

www.avidsynergy.com/pdf/SinOfXdividedByXintegration.pdf

Sum of Cosines and the Improper Integral of Sin(x)/x

www.avidsynergy.com/pdf/SinOfXdividedByXintegration_article.pdf

Here you will find mathematics article for high school and college students: "Error Function, Dirichlet Kernel and the Improper Integral of Sin(x)/x"

www.avidsynergy.com/pdf/sin_x_div_by_x_integral.pdf