How to substitute function in ODE?

Question:How to substitute function in ODE?

Posted: Yunjae Shin 0 Product: Maple

September 18 2015

I have y"+y=sinx

If I want to substitute y=sinx, how should I do it?

I tried subs(y=sin(x),f(y))(ofc after defining f:=y as above).

The most troubling thing is that it does not automatically apply double derivative.

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