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lim_(y->0) ((tan(pi(y+1/2)))/(2 (y+1/2)-1)+2/pi(2 (y+1/2)-1)^2)
lim_(y->0) ((tan(pi(y+1/2)))/(2 (y+1/2)-1)+2/pi(2 (y+1/2)-1)^2)
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