> phi:=sum(1/(4*3.1415926535897932354626)*16/(3.1415926^2)*sin((2*k+1)*3.1415926535897932354626*x)/((2*k+1)^3)*(1-cosh((2*k+1)*3.1415926535897932354626*(.25-1/2))/cosh((2*k+1)*3.1415926535897932354626/2)),k = 0 .. 100);phi1:=5/4*x*(1-x)*0.25*(1-0.25);

>

> plot([phi,phi1], x=0..1, color=[red,blue]);

>

>

> phi:=sum(1/(4*3.1415926535897932354626)*16/(3.1415926^2)*sin((2*k+1)*3.1415926535897932354626*x)/((2*k+1)^3)*(1-cosh((2*k+1)*3.1415926535897932354626*(0.5-1/2))/cosh((2*k+1)*3.1415926535897932354626/2)),k = 0 .. 100);phi1:=5/4*x*(1-x)*0.5*(1-0.5);

> plot([phi,phi1], x=0..1, color=[red,blue]);

>