| 1 | initial version |
Try :
sage: f=function("f")
sage: import sympy
sage: Res = [u._sage_() for u in sympy.dsolve(*map(sympy.sympify, (f(x).diff(x)^2+1, f(x))))] ; Res
[f(x) == C1 - I*x, f(x) == C1 + I*x]
HTH,
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