Updates:
        Cc: ondrej.certik

Comment #7 on issue 983 by smichr: improvement to solve()
http://code.google.com/p/sympy/issues/detail?id=983

As of 1694:

I,v,V = symbols('IvV')
i = I*(exp(v/V) - 1)
k = i.diff(v,2)/(1 + (i.diff(v))**2)**Rational(3,2)
dk = k.diff(v)
solve(dk, v)
[-oo, V*log(V**2/(2*I**2))/2]


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