I’m doing the attached question.

I’m ok up until part c. I want it integrate the curve from point P to where the curve cuts the x axis which I think is when x =5 and if the integration is in trig then I shouldn’t be using that anyway. But what do I integrate. I suppose it’s 4 sin theta.

I looked at the answer and it integrates (4 sin theta)(-5 sin theta) between 0 and pi/4

I’m at a loss as to why any of that.

Thanks

I’m ok up until part c. I want it integrate the curve from point P to where the curve cuts the x axis which I think is when x =5 and if the integration is in trig then I shouldn’t be using that anyway. But what do I integrate. I suppose it’s 4 sin theta.

I looked at the answer and it integrates (4 sin theta)(-5 sin theta) between 0 and pi/4

I’m at a loss as to why any of that.

Thanks

Original post by maggiehodgson

I’m doing the attached question.

I’m ok up until part c. I want it integrate the curve from point P to where the curve cuts the x axis which I think is when x =5 and if the integration is in trig then I shouldn’t be using that anyway. But what do I integrate. I suppose it’s 4 sin theta.

I looked at the answer and it integrates (4 sin theta)(-5 sin theta) between 0 and pi/4

I’m at a loss as to why any of that.

Thanks

I’m ok up until part c. I want it integrate the curve from point P to where the curve cuts the x axis which I think is when x =5 and if the integration is in trig then I shouldn’t be using that anyway. But what do I integrate. I suppose it’s 4 sin theta.

I looked at the answer and it integrates (4 sin theta)(-5 sin theta) between 0 and pi/4

I’m at a loss as to why any of that.

Thanks

Int y dx = Int y dx/dt dt

https://www.savemyexams.com/a-level/maths_pure/edexcel/18/revision-notes/9-parametric-equations/9-2-further-parametric-equations/9-2-2-parametric-integration/

Really, putting in the dependencies youre doing

Int y(x) dx = Int y(x(t)) dx(t)/dt dt

So all you need to do is be clear about which representation/space youre working with.

(edited 6 months ago)

Thanks for your reply. I did a bit of deep thought and I now understand the solution.

Original post by maggiehodgson

Thanks for your reply. I did a bit of deep thought and I now understand the solution.

what as your working and solution? I've been stuck on this question all day

Original post by Prince2006

what as your working and solution? I've been stuck on this question all day

We don't post solutions as that's against forum rules - if you post your work we'll give a hint.

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can someone please explain what principle domain is and why the answer is a not c?Maths

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