# Solving 1st order non-linear differential Equation

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• December 6th 2008, 11:50 AM
invincible110
Solving 1st order non-linear differential Equation
How do you solve this differential equation:

$1/2(f')^2 + f - 1/3 (f)^3 = C$

I think the answer for f should have a tanh function somewhere in it.

Thanks