6th Years & Leavers :: Chat Thread #4 :: This is sooo old, man. Go to thread #5 ;)

11. How many solutions does the equation
( $4\sin x-\sqrt{5}$ )( $\sin x + 1$ ) $= 0$

have in the interval $0<x<2\pi$?

I get:

$4\sin x-\sqrt{5}=0$ or $\sin x+1=0$
$\sin x\frac{\sqrt{5}}{4}$ or $\sin x=-1$

As $\frac{\sqrt{5}}{4}<1$, there are two solutions in $0<x<2\pi$ hence there are 3 solutions.

My lecturer said there was only 2. Where am I going wrong?

Perhaps a better night's sleep is more beneficial than cramming? Although my teacher always used to say that if you feel confident going into an exam then you've prepared enough for that exam.

Fixed LaTeX.

You're a gem. Ta.

No probs. Your lecturer's wrong, unless I'm seriously crazy. The graph clearly has three roots.

Omg, that bugger. Thanks. I'm just going over vector questions now

Get some sleep missy so you'll be in tip-top shape for tomorrow.

No probs. Your lecturer's wrong, unless I'm seriously crazy. The graph clearly has three roots.

Well, that was a complete and utter epic fail. Paper 1 multiple choice was lovely, section B was ugh, paper two was just a complete and utter-mind rape, there is no way that was higher level.

http://twitter.com/prelimpapers I'm going to kill them

I think I like finished 5 questions in the whole of paper 2. I'll be lucky if I even get a D lol.

Perfect Papers and P&N are always set harder than the real papers.



Do you remember any of the questions?

Well, that was a complete and utter epic fail. Paper 1 multiple choice was lovely, section B was ugh, paper two was just a complete and utter-mind rape, there is no way that was higher level.

http://twitter.com/prelimpapers I'm going to kill them

I think I like finished 5 questions in the whole of paper 2. I'll be lucky if I even get a D lol.

Well, there was a bitch of a question to do with altitude and vertices, and it said "find the equation of the median"...there was only a triangle with no lines going through it, at all So that threw me off.

I missed out the optimization one.

A lot of them were really vague. It was so annoyingly ****. But everyone came out saying "I've totally failed that" and a lot of people were leaving early! Maybe my lecturer tampered with it.

I missed out a really easy 5 marker by accident. >_< Something like prove 2cosx+ sinx = 0 (forgot)

blegh

If everyone did badly the pass mark would be low right?

Hopefully. But, that's any chance of an appeal out the window Meh, trying to get an appeal is like trying to get blood from a stone I suppose.

I was expecting to do well in this one, oops.

You should count yourself lucky. When I did my Higher Maths there was no such thing as multiple choice!

You should count yourself lucky. When I did my Higher Maths there was no such thing as multiple choice!