C3 January 2013 25/01/2013

Reply 1760

This Excellency

Just for fun. Despite the fact that we can't tell :rolleyes:

Predictions anyone?

Reply 1761

ThatRandomGuy

1

Sneaky feeling arcsin/cos stuff is going to come up.

Reply 1762

dan94adibi

14

Original post by posthumus

Sorry but for the previous question could you tell me what the range was ? :frown:

I still think its all real numbers.. I showed my brother the graph and he thinks so too.

So I'm really confused about -infinity thing

The range is all real numbers. :biggrin:

Reply 1763

otrivine

14

Original post by dan94adibi

The range is all real numbers. :biggrin:

the solomon made a mistake on one of the question http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId=1152244&ResourceId=3992029

question 6)a) http://www.school-portal.co.uk/GroupDownloadFile.asp?GroupId=1152244&ResourceId=3992017 mark scheme

they forgot for sin2A= to put the 2 in front of sinxcosx if u look

Reply 1764

Qmakz

5

Original post by AS01

yes u do g^-1g(x) but what is the answer?

its just x

Reply 1765

suncake

14

Original post by This Excellency

Just for fun. Despite the fact that we can't tell :rolleyes:

Predictions anyone?

One of those lovely "Express dy/dx in terms of x" things, where you have to do dx/dy first :colone:

Arcsin/cos/tan is always a suspect because it hardly comes up... but it probably won't come up this time either :lol:

Hope the logs/exponentials questions aren't too tricky...

Reply 1766

Skaterkid

9

that trig question is such a basted on the june 2012 paper

Reply 1767

patterson

11

Original post by posthumus

Enjoy !

Thanks Mate.

Reply 1768

This Excellency

Original post by ThatRandomGuy

Sneaky
feeling arcsin/cos stuff is going to come up.

Yeah, that would be sneaky of them :colone:

Prepare for everything :tongue:

So how comes you didn't revise for this?

Original post by suncake

One of those lovely
"Express dy/dx in terms of x" things, where you
have to do dx/dy first :colone:

Arcsin/cos/tan is always a suspect because it
hardly comes up... but it probably won't come up
this time either :lol:

Hope the logs/exponentials questions aren't too
tricky...

That would be nice :colone:

June 2007 had a ugly log question that I just about managed to kill off :redface:

I'm just excited to finish C3 so we can start C4 and M2 :dance:

Reply 1769

franzk

OP

11

some form of trig graphs my best guess for this exam

Reply 1770

posthumus

20

Original post by franzk

some form of trig graphs my best guess for this exam

What do you think this trig graph question would be like ? :smile:

EDIT: Oh right I see what you mean... a question involving arcsin & the inverse graphs. Yup thats quite likely :smile:

Reply 1771

Dragonrage973

2

Tips for tomorrow - ALWAYS check your answers by plugging things back into the original equation (especially on trig). And don't take any short cuts write out ALL working in full! (I've made silly errors on other modules before which cost me a whole grade).

Anyway good luck everyone hope this exam doesn't whip us too hard! (I know that didn't really make sense but I can't think of some clever analogy right now) :tongue:

Reply 1772

suncake

14

Original post by This Excellency

That would be nice :colone:

June 2007 had a ugly log question that I just about managed to kill off :redface:

I'm just excited to finish C3 so we can start C4 and M2 :dance:

Just looked it up, and yes, that question was just.. eww. :tongue:

C4 is pretty nice in comparison to C3! Never done mechanics but it seems interesting :smile:

I've basically spent the past hour faffing around with my new hat, instead of doing any revision... Gonna blast through another past paper, then bed time for me. Good luck for tomorrow, everyone! :h:

Reply 1773

This Excellency

Original post by suncake

Just looked it up,
and yes, that question was just.. eww.
C4 is pretty nice in comparison to C3! Never done
mechanics but it seems interesting

I've basically spent the past hour faffing around
with my new hat, instead of doing any revision...
Gonna blast through another past paper, then
bed time for me. Good luck for tomorrow,
everyone! :h:

I hope so! My teacher reckons it's easier than C3 but then again, he teaches maths for a reason. :rolleyes:

New hat

Pimp hat? Rap star hat? Top hat?
I wish I could wear hats. I just look weird :tongue:

Haven't been doing any work either. I'm just watching Southland :tongue:

We still have all of tomorrow morning to do some last minute prep.

Good luck to you too :h:

You going for the A*?

Reply 1774

Bulbasaur

17

Original post by suncake

Just looked it up, and yes, that question was just.. eww. :tongue:

C4 is pretty nice in comparison to C3! Never done mechanics but it seems interesting :smile:

I've basically spent the past hour faffing around with my new hat, instead of doing any revision... Gonna blast through another past paper, then bed time for me. Good luck for tomorrow, everyone! :h:

That's a relief! :tongue:

C3 isn't exactly hard, it's just annoying.

Reply 1775

Skaterkid

9

how would you do this someone!!! what values would you put into tan(a+b)

Reply 1776

MyNameIsRay

7

How do you differentiate these:
Sec kx
Cot kx
Cosec kx

is it:
ksec(kx)tan(kx)
-kcosec^2(kx)
-kcosec(kx)cot(kx)

(They're not on data sheet with k, only tankx is)

I have a question with y=e^(2x) sec(3x) and need to find dy/dx and not sure what to do for sec.
I know I can just make it e^(2x) / cos(3x) and use the quotient rule but I would rather learn this way ^^

Reply 1777

oli_G

12

Original post by MyNameIsRay

How do you differentiate these:
Sec kx
Cot kx
Cosec kx

is it:
ksec(kx)tan(kx)
-kcosec^2(kx)
-kcosec(kx)cot(kx)

(They're not on data sheet with k, only tankx is)

I have a question with y=e^(2x) sec(3x) and need to find dy/dx and not sure what to do for sec.
I know I can just make it e^(2x) / cos(3x) and use the quotient rule but I would rather learn this way ^^

If

y=e^{2x}sec(3x)

;

\frac{dy}{dx}=2e^{2x}sec(3x)+3tan(3x)sec(3x)e^{2x}=e^{2x}sec(3x)(2+3tan(3x))

Reply 1778

Alex_1

Has anyone been taught how to do the half angle questions? Do we need to know that for our exams? I'm really starting to panic now :erm:

Reply 1779

posthumus

20

Original post by MyNameIsRay

How do you differentiate these:
Sec kx
Cot kx
Cosec kx

is it:
ksec(kx)tan(kx)
-kcosec^2(kx)
-kcosec(kx)cot(kx)

(They're not on data sheet with k, only tankx is)

I have a question with y=e^(2x) sec(3x) and need to find dy/dx and not sure what to do for sec.
I know I can just make it e^(2x) / cos(3x) and use the quotient rule but I would rather learn this way ^^

for cot(kx)

y=[tan(kx)]^-1

dy/dx = -k[sec^2(kx)]^-2

???? :confused:

C3 January 2013 25/01/2013

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