d= v*t, t= sqrt( r*r+d*d)/c, H= 1/(r*r) - 1/(r*r+d*d), solve(H,d,t)d= v*t, t= sqrt( r*r+d*d)/c, H= 1/(r*r) - 1/(r*r+d*d), solve(H,d,t)

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