Hello,
I want to solve f''/f=k with k in R
sage: x=var('x')
sage: f=function('f',x)
sage: k=var('k')
sage: desolve(diff(f(x),x,2)/f(x)==k^2+1,[f,x])
k1*e^(I*sqrt(-k^2 - 1)*x) + k2*e^(-I*sqrt(-k^2 - 1)*x)
I put k^2+1 since sage would'nt solve even with assume(k>0)
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