C3 January 2013 25/01/2013

Reply 1900

Jabz257

9

Original post by posthumus

3cos2x-sin2x = 0

tan2x=3

I'm sure you can work it out from there :smile:

I got to as tan2x = 3/2?

Reply 1901

Henry.Lister

I got to as tan2x = 3/2?

Yeah, that was correct. It gives you x= 0.491 to 3 s.f

Reply 1902

Jullith

Good luck everyone! :thumbsup:

<3

Reply 1903

MLogan

Good Luck Everyone! Hopefully we wont come out cursing Edexcel :/

Reply 1904

posthumus

20

Original post by Jabz257

I got to as tan2x = 3/2?

forgot the 2 infront of the sin my bad

Reply 1905

posthumus

20

Quick silly question guys !!!!!!

sin(A+B) + sin(A-B) = sin(6x)cos(x/2)

Theres not 2 infront here ^^

How would I get it in the form

sin(A+B) + sin(A-B) ???

EDIT: & also how do I do it vise vera...

Sin(6x) + (x/2)

^ put that in the form' sin(P+Q/2)cos(P-Q/2)

(edited 11 years ago)

Good luck! :d

Best of luck to anyone doing this exam, I never performed well in C3, even despite the fact that it's not a horrible module!

I'm gonna do the exam in June, because I already did it in June 12 and didn't do to well! Oh the joys of my gap year.

(edited 11 years ago)

Reply 1908

Jabz257

9

Original post by posthumus

Quick silly question guys !!!!!!

sin(A+B) + sin(A-B) = sin(6x)cos(x/2)

Theres not 2 infront here ^^

How would I get it in the form

sin(A+B) + sin(A-B) ???

EDIT: & also how do I do it vise vera...

Sin(6x) + (x/2)

^ put that in the form' sin(P+Q/2)cos(P-Q/2)

Do you use the additional formulae? :s-smilie:

Reply 1909

Tikara

good luck everyone! hope there isn't a stupid 10 marker or something, but hopefully it's a good paper :smile:

Reply 1910

AliceMedawar

Anyone got any last min A* questions? I'm sure they are here somewhere but don't have time to look :/
Thanks and good luck!

Reply 1911

AliceMedawar

Original post by James A

Best of luck to anyone doing this exam, I never performed well in C3, even despite the fact that it's not a horrible module!

I'm gonna do the exam in June, because I already did it in June 12 and didn't do to well! Oh the joys of my gap year.

Same! Love C3 so much i've taken it 4 times haha
Good luck. 5th time lucky right!

Reply 1912

F1's Finest

21

Original post by AliceMedawar

Same! Love C3 so much i've taken it 4 times haha
Good luck. 5th time lucky right!

Nice, you will do well this time!

Best of luck!

hoi i can post.

We can post after 24 hours right???

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Reply 1915

PlutoMars

I think past 4am is ok

Reply 1916

Nia_Beth

9

http://www.thestudentroom.co.uk/showthread.php?t=2239941 is where the partayy's at lol

Reply 1917

Arsey

10

model answers

http://www.thestudentroom.co.uk/showthread.php?t=2240433&p=41221865#post41221865

Reply 1918

Zzzyax

2

Can someone help me: on question 4B, i thought that the max value would occur when
10cos(theta -0.927) equal to 0 instead of -10, i found the correct value for theta and so on, will i get any method marks for this?

Reply 1919

a10

19

Original post by Zzzyax

Can someone help me: on question 4B, i thought that the max value would occur when
10cos(theta -0.927) equal to 0 instead of -10, i found the correct value for theta and so on, will i get any method marks for this?

which question are you talking about? post up the question then ill be able to help :smile:

C3 January 2013 25/01/2013

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