C3 January 2013 25/01/2013

Reply 1580

otrivine

14

Original post by AS01

1/2 for that?

as their answer

Reply 1581

senz72

19

Original post by Y_123456

I work out the points before plotting the graph.
For example, is P is at (4, 2), I will plot the point at (7, 4).
Because the horizontal translation is +3 to the right (X + 3), and vertical stretch is by the factor 2 (Y x 2).

Sorry, I asked the question incorrectly.

It was a different question. Thanks anyway. :smile:

Reply 1582

gaffer dean

Original post by TheNoobyPotato

hey guys, say we had 2f(x) + 2, since they both affect y values, which is applied first, and why?

you have to do y-coordinate * 2 first and then y-co-ordinate +4. But, i'm not sure why.

Reply 1583

AS01

12

Original post by otrivine

as their answer

so its not even root3/root2?

Reply 1584

Hadley112

0=Theta

When doing RSin(0-Alpha) for exampe, for 2sin0-1.5cos0

How do you know which number is A and which is B?!

Reply 1585

otrivine

14

Original post by AS01

so its not even root3/root2?

well its not either of our answers, so i was not sure of that

Reply 1586

This Excellency

Original post by TheNoobyPotato

hey guys,
say we had 2f(x) + 2, since they both affect y
values, which is applied first, and why?

Original function was f(x)

You multiplied it by 2

2f(x)

And then added 2 to the product

2f(x) + 2

Reply 1587

posthumus

20

Original post by Hadley112

0=Theta

When doing RSin(0-Alpha) for exampe, for 2sin0-1.5cos0

How do you know which number is A and which is B?!

What do you mean by A & B ?

Are you talking about factor formulae ? :smile:

Reply 1588

JenniS

2

do you think they would ever ask you to draw the graphs of arcsin or arccos etc?? just noticed that section in the book...... :/

Reply 1589

Nehal:)

14

Need some help :frown:

I think i'm being really silly, or my calculator is just playing up.
i'm doing Jan 2012,Q4. So im subbing in the y coordinate into the equation however i get 0.03655...
It should be 2 root 3. like on here http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=30&solution=4.1
what am I dong wrong?
I'm in degrees, but I don't know if any other set up is wrong on my calc.

Thank you in advance!

Reply 1590

Nehal:)

14

Original post by JenniS

do you think they would ever ask you to draw the graphs of arcsin or arccos etc?? just noticed that section in the book...... :/

I hope not.... >.<

Reply 1591

AS01

12

Original post by otrivine

well its not either of our answers, so i was not sure of that

I don't think we can get 1/2 as the answer.

Reply 1592

otrivine

14

Original post by AS01

I don't think we can get 1/2 as the answer.

but the mark scheme got 1/2 root 6 ?

Reply 1593

Hadley112

Original post by posthumus

What do you mean by A & B ?

Are you talking about factor formulae ? :smile:

Yeah, writing it in the form RCos(0-Alpha) !

Reply 1594

ginister

11

Best of luck to all of you. I'm going to keep quiet now :smile:

Reply 1595

AS01

12

Original post by otrivine

but the mark scheme got 1/2 root 6 ?

is root6 in the denominatior or numerator?
if root 6 is in numerator then you have to just rationalise root3/root2

Reply 1596

Qmakz

5

Original post by Nehal:)

Need some help :frown:

I think i'm being really silly, or my calculator is just playing up.
i'm doing Jan 2012,Q4. So im subbing in the y coordinate into the equation however i get 0.03655...
It should be 2 root 3. like on here http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=30&solution=4.1
what am I dong wrong?
I'm in degrees, but I don't know if any other set up is wrong on my calc.

Thank you in advance!

switch to radians