Leaving Cert Maths. P2 1999 Q2cii)

blacklionboy

1999 paper 2 q2 cii. Does anyone know how to do this?

ajjmk

higher or ordinary level..?

blacklionboy

higher level. just trying to get my head around it for monday!

ajjmk

shoot, i thought i had that one done out but i dont..:(
..eeemmm..damn, it looks really hard! sorry, i havnt a clue..im screwwwed monday! :eek:

EuropeanSon

Just looking at it, I'd say you just find the unit vector of ad, and what's in the brackets (they are equal), then find the two angles and show they are equal if the first bit is equal. All this in terms of a, b, c and d of course. Hope that helps.

blacklionboy

could you do it out? ive been playing around with it for quite the while
cheers

Psychedelia

eww... that's not nice but:

http://www.studentxpress.ie/papers/vectorsoln1999.pdf

EuropeanSon

blacklionboy wrote: »

could you do it out? ive been playing around with it for quite the while
cheers

Give me 15 minutes. I've got to get on a PC for that, itd take too long to post it from my itouch.

blacklionboy

thanks! much appreciated!!

blacklionboy

Seems so simple now. Hope something like it shows up now!!

EuropeanSon

Ah. I was on entirely the wrong track. Nasty one, hopefully it won't make an appearance on Monday, if possible I prefer more numbers and less variables.

Still, glad you posted it, I'm prepared now for something similar, so if it does come up I'll be happy you posted it.

blacklionboy

at least we'll have an idea what to do if it shows! Do u guys reckon we're in for a tough paper 2?

EuropeanSon

I hope not, but given how easy paper 1 was (or at least I thought so), I'd say so. If it isn't hard they're going to have to mark them really tough.

Ashashi

Ooft, that's disgusting looking, I was on the wrong track. Gave each point a specif vector and tried it from there.

This was mentioned by Adrian Roantree in Exam Brief, I can see why. Parts leading up to it are normal though.