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## Main Question or Discussion Point

So I have never solved a second order NON LINEAR ode before, but my current project has thrown one at me.

I am going to use matlab to solve it when I have it in the correct state, but at the mo, I cant get it to that...

Its three coulped equations, in terms of x,theta and x2. They are in a matrix, ma + cv + kx = force

for each one.

The way they are coupled though is a trigonometric relationship between x and theta and x2.

I.E

theta = f(x)

x2 = f(x)

and x changes with time.

What should I do to include this relationship?

I am going to use matlab to solve it when I have it in the correct state, but at the mo, I cant get it to that...

Its three coulped equations, in terms of x,theta and x2. They are in a matrix, ma + cv + kx = force

for each one.

The way they are coupled though is a trigonometric relationship between x and theta and x2.

I.E

theta = f(x)

x2 = f(x)

and x changes with time.

What should I do to include this relationship?