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# C3 Edexcel Specimen Paper Help!! Watch

1. Has anyone completed the C3 specimen paper?
I'm stuck on questions 6(f) and 7 because the mark scheme doesn't show the full working out.
Thanks.
2. Post the question and your attempt at answering it, and then more people (e.g. me) will be able to help than just the few who have the C3 Edexcel specimen paper.
3. Sorry!
I just attached the paper.
Attached Images
4. C3%20Specimen.pdf (64.1 KB, 680 views)
5. (Original post by rafaelvdv93)
Sorry!
I just attached the paper.
For 7), you can rewrite . And ofcourse you've always got the quotient rule under your sleeve when things start to misbehave lol.

Does that help?
6. For 6f, I've not read through the question but I believe it's telling you - from my glance - that
you've already found for part e, so just set it equal to -1.8 and solve for little t. Then, sub back into your equation and solve for big T.
7. 7)

i) I assume you can do this
ii) Find dx/dy. Take the inverse, use a trig identity and replace tan^2(y/2) with x
iii) I get dy/dx =

So R cos = 2 and R sin = 1

Therefore = arctan (1/2)
So
Which means
8. Thanks everyone!
I definitely understand 6(f) and 7(i)(ii) now!
But I'm still unsure about 7(iii)
I don't understand how you got the values of R cos(alpha) and R sin(alpha).
9. (Original post by electriic_ink)
7)

i) I assume you can do this
ii) Find dx/dy. Take the inverse, use a trig identity and replace tan^2(y/2) with x
iii) I get dy/dx =

So R cos = 2 and R sin = 1

Therefore = arctan (1/2)
So
Which means
where does sin alpha =1/5 come from?

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