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☭ Вильфредо Ульянов ☭

@wilfredo_666
AR

2.5+(10/pi)*(sin(pi*x/4)+(1/3*sin(3*pi*x/4))+(1/5*sin(5*pi*x/4))+(1/7*sin(7*pi*x/4))+(1/9*sin(9*pi*x/4))+(1/11*sin(11*pi*x/4))+(1/13*sin(13*pi*x/4))+(1/15*sin(15*pi*x/4))...