Edexcel A2 C4 Mathematics June 2016 - Official Thread

Oh crap yeah hahaha sorry.

But the integral of 2/x^2 does equal -2/x right? (just checking)

So how would you do part C of this question?

+ c

and your averages are?? mines are 75-90%

I'm actually practising GCSE trig...

Never know with them vectors

Could we be asked to find shortest distance between two lines I thought this was fp3?

Could we be asked to find shortest distance between two lines I thought this was fp3?

Same

@Zacken @Euclidean @ccharlie97

which paper is that? i've been looking for ages for that question

Certainly I recall the shortest distance between skew lines is in fp3. I don't think you can be asked that...might wanna check the spec. But when it comes to parallel lines, you want to find a distance along a line that is perpendicular to both and intersects both..probably can use dot product and simultaneous equations to find such a line (of course, there will be many, but you can just fix one or two things until you are rid of all arbitrary variables) and then just find the distance between the points of intersection along that line. Or you may be given this in a scenario where you can do it quickly with trig

You'll never be asked to integrate something like that for C4, that would integrate into arctan(...) or artanh(...) or something, can't really remember off the top of my head but that's only on the FP3 spec.

I would just use cross product for parralel lines tbh, will I still get marks for that method?

Oh yeah lol, was thinking with my C4 hat on.. hmm probably, but you better make sure the final answer is right

In question 7c why cant I do vector CB instead of CB it gives me mu = 5 not -5Which gives wrong point when subed.https://5c59854d0ccd29d489c9e5e689a8bbadf49aa0f0.googledrive.com/host/0B1ZiqBksUHNYREhxMHhfam1IQm8/for-Edexcel/Solomon%20J%20QP%20-%20C4%20Edexcel.pdf