How can I find the analytical solution for the system?

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SUMMARY

The discussion focuses on solving the differential equation dx(t)/dt = N0*sin(omega*t) * x(t) - (N0*x^2 / k) using Bernoulli equations. The participant attempted to derive a solution but struggled with the integral involving the exponential function, specifically the form ∫ e^(1/ω cos(ωt)) dt, which lacks an elementary antiderivative. The conversation emphasizes the need to express results in terms of unevaluated integrals due to the complexity of the equation.

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Homework Statement



dx(t)/dt = N0*sin(omega*t) * x(t) - ( N0*x^2 / k )

Omega,N0 and k are positive .

Homework Equations

The Attempt at a Solution


I tried to solve it using the Bernoulli equations but I could not get the last result.
 
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Show us what happens with the Bernoulli substitution so we can see what your difficulty is.
 
Here's the DE in a bit more readable form.
$$ \frac{dx}{dt} = N_0x(\sin(\omega t) - \frac{x}{k})$$
 
Last edited:
The result that I got is :

exp( (cos(omega*t) * (-N0/omega)) / x(t) = (N0 / k) * ( integral (exp( (cos(omega*t)) * (-N0/omega) ) ) ) dt

So I do not know how to find the integral when typically there is no specific solution for the integral of the Exponential function.
 
You may just have to express the result in terms of unevaluated integrals. Integrals of the form ##\int e^{\frac 1 \omega \cos(\omega t)}~dt## don't have elementary antiderivatives.
 

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