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# AQA FP3 - 2nd Order Differential Equations Watch

1. Hi All, working through an FP3 AQA Past paper - im on a reasonably horrible 2nd order differential equation:

I can't fully understand how they get from line 2 working (which I have) to line 3. I realise that they've simplified the (dx/dt)*(dy/dx) in line two to give dy/dt in line three. But how they get from x*(d/dt)*(dy/dx) in line 2 to x*(dx/dt)*(d/dx)*(dy/dx) in line three is a mystery! Any help or pointers would be greatly appreciated

Thanks again

2. Dont worry people - misread something
3. (Original post by Hunarench95)
Hi All, working through an FP3 AQA Past paper - im on a reasonably horrible 2nd order differential equation:

I can't fully understand how they get from line 2 working (which I have) to line 3. I realise that they've simplified the (dx/dt)*(dy/dx) in line two to give dy/dt in line three. But how they get from x*(d/dt)*(dy/dx) in line 2 to x*(dx/dt)*(d/dx)*(dy/dx) in line three is a mystery! Any help or pointers would be greatly appreciated

Thanks again

4. (Original post by ztibor)
Thanks bud - a lot more straight forward than I thought it would of been (I was looking for something a lot more complex!!)

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