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g=1/2
Sn=π*(1-(1/2)^n)/(1-1/2)=π*(1- 1/2^n)/1/2=2 π*(1- 1/2^n)=2π- π/2^(n-1)
lim sin[2π- π/2^(n-1)-π/2]=
n->∞
sin lim [3/2π- π/2^(n-1)]=sin3/2π=-1
n->∞