sqrt(2)*sin(pi*x),0<x<1

4*sqrt(2)/(3*pi)*sin(pi*x/2)+1/sqrt(2)*sin(pi*x)+sum(4*sqrt(2)*sin(k*pi/2)/(4*pi-(k^2*pi))*sin([k*pi/2*x]),k=3,n),0<x<2

Picturing http://www.builtonfacts.com/2008/07/25/down-the-well

1/sqrt(2)*sin(pi*x),0<x<2

4*sqrt(2)*sin(a*pi/2)/(4*pi-(a^2*pi))*sin([a*pi/2*x]),0<x<2,in(a,set(1,3,4,5,6,7,8,9,10))

Graph of the formula

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