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a=0.7
y1=(1.3933*y.^2./(x.^2+eps)-1).^2.*a.*sqrt(1.1084*y.^2-x.^2).*besselj(0,a.*(sqrt(1.1084*y.^2-x.^2)+eps))./besselj(1,a.*(sqrt(1.1084*y.^2-x.^2)+eps));
y2=(1.1084*y.^2./(x.^2+eps)-1).*(1.3933*y.^2./(x.^2+eps)-a.*(sqrt(2.7865*y.^2-x.^2)+eps).*besselj(0,a.*(sqrt(2.7865*y.^2-x.^2)+eps))./besselj(1,a.*(sqrt(2.7865*y.^2-x.^2)+eps)));
f=y1-y2;
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