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simple quetion, as you can see in the title.

How can I solve differential equation y(x)''=f(y(x))

I know I can write first derivative like dy/dx. But how can I write second derivative in such form?

If it would be y(x)'=y, then it can be writen dy/dx=y

=> (1/y)dy=(1)dx

=> I can integrate ln(y)+C=x

=> its clear from now on

I need some similar solution for situation when I have second derivative on the left side and some function consisting just y(x) (not x itself) on the right.

Thanks for helping

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# Differential equation y(x)''=f(y(x))

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