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lim d(1/(sqrt(4 pi^2 ((-v^2) + sqrt( v^4 + 4 10^2 1^2))/(2 * 10^2))))/dv
lim d(1/(sqrt(4 pi^2 ((-v^2) + sqrt( v^4 + 4 10^2 1^2))/(2 * 10^2))))/dv
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