PAT Solutions.

OP

Original post by und

Well in that case, it would indeed give you the right answer, but we're still trying to understand why it gives incorrect solutions when factored out.

I don't understand. You still get tan3x=rt3....

Reply 62

OP

Original post by und

And...*drumroll*... here's our answer: http://www.thestudentroom.co.uk/showthread.php?p=34599534#post34599534

So,

2010 Q1 (i)

Spoiler

I could swear ML alreadly got that solution....

Reply 63

ElMoro

18

Original post by und

Well in that case, it would indeed give you the right answer, but we're still trying to understand why it gives incorrect solutions when factored out.

Firstly, you can see from the original equation cos x != 0 so you should just divide by it

Secondly, when you divide out and have tan x in one bracket you are implying that cos x != 0 since if it was then tan x would be undefined

Reply 64

und

16

Original post by wcp100

I could swear ML alreadly got that solution....

Yes, just with a different method. We've got to remember that all PAT questions are accessible to those who haven't studies any maths beyond AS level.

Original post by ElMoro

Firstly, you can see from the original equation cos x != 0 so you should just divide by it

Secondly, when you divide out and have tan x in one bracket you are implying that cos x != 0 since if it was then tan x would be undefined

Yes, it's easy to miss that if you haven't done any similar questions before.

(edited 12 years ago)

Reply 65

Original post by und

And...*drumroll*... here's our answer: http://www.thestudentroom.co.uk/showthread.php?p=34599534#post34599534

So,

2010 Q1 (i)

Spoiler

Oooooooh. That makes sense! :biggrin:

Didn't I just do the same thing but a different way? :curious:

Original post by wcp100

I could swear ML alreadly got that solution....

Hmmm... Maybe he meant trying to get the solution without having to use harmonic addition. :holmes:

Reply 66

Original post by ElMoro

Firstly, you can see from the original equation cos x != 0 so you should just divide by it

Secondly, when you divide out and have tan x in one bracket you are implying that cos x != 0 since if it was then tan x would be undefined

Took my a while to figure out what != was... "not equal to zero" would have been a bit less confusing.

EDIT: Or maybe it's just me... :ninja:

(edited 12 years ago)

Reply 67

und

16

Original post by Maths_Lover

Hmmm... Maybe he meant trying to get the solution without having to use harmonic addition. :holmes:

This, because harmonic addition isn't in the AS course.

Reply 68

OP

Original post by und

Yes, it's easy to miss that if you haven't done any similar questions before.

Yeh I suppose....

Reply 69

Original post by und

This, because harmonic addition isn't in the AS course.

OK. Would they care though, if you used harmonic addition?

Reply 70

ElMoro

18

Original post by und

Yes, it's easy to miss that if you haven't done any similar questions before.

I wasn't criticising, just answering your question

Reply 71

OP

Original post by Maths_Lover

Took my a while to figure out what != was... "not equal to zero" would have been a bit less confusing.

It's programming lanuage != :tongue:

Reply 72

OP

Original post by Maths_Lover

OK. Would they care though, if you used harmonic addition?

I doubt it. It would take a lot more time though....

Reply 73

OP

We are reviving this thread. Woooooo

Reply 74

und

16

Original post by ElMoro

I wasn't criticising, just answering your question

I didn't take it as criticism. Thanks for clarifying it.

Reply 75

Original post by wcp100

It's programming lanuage != :tongue:

That's why I didn't understand. I knew I should have read more about programming... :emo:

Original post by wcp100

I doubt it. It would take a lot more time though....

Yeah! Hence this:

Original post by Maths_Lover

Why are the marks for Q1 so disproportionately awarded? 3 marks for each and part (i) takes so much longer than part (ii)... :holmes:

Oh, my naivety. :rofl:

Original post by wcp100

We are reviving this thread. Woooooo

Once I finish M1/C3 this week, I will be on here a lot more often. :h:

Reply 76

ElMoro

18

Original post by Maths_Lover

Took my a while to figure out what != was... "not equal to zero" would have been a bit less confusing.

EDIT: Or maybe it's just me... :ninja:

Thought it was fairly standard notation, tbh (and not just in programming) :dontknow:

Reply 77

OP

Original post by Maths_Lover

That's why I didn't understand. I knew I should have read more about programming... :emo:

Yeah! Hence this:

Oh, my naivety. :rofl:

Once I finish M1/C3 this week, I will be on here a lot more often. :h:

I wouldn't bother if you aren't planning on actually programming :tongue:

Haha

Is it wrong of me to find rocket science the easiest bit of mechanics? Also can you check my latest answers? (please :biggrin:

)

I'm bored with C1. My maths teacher has noticed this. She sits with me going through STEP questions when I get really bored :biggrin:

Reply 78