Mathematics: Post your doubts here!

[Rutzaba]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w04_qp_3.pdf

Q4(i)

I get 3Tan^2(x) + 6Tan(x) -1 = 0 not as in the question please help !!

did u do this
(1+tanx)^2 =2 (1-tanx)^2

 

[Haya Ahmed]

Rutzaba
sorry for the sloopy handwriting

 

[Rutzaba]

Rutzaba
sorry for the sloopy handwriting

cmon baby u must know how to open the brackets ryt
(1-tanx)^2 = 1-2tanx + tan^2 x

 

[Thought blocker]

cmon baby u must know how to open the brackets ryt
(1-tanx)^2 = 1-2tanx + tan^2 x

Ofc looking at her scribble work, she doesnt know.

 

[Rutzaba]

Ofc looking at her scribble work, she doesnt know.

its ok blocky... once upon a tym even we dint know how to do it

 

[Haya Ahmed]

cmon baby u must know how to open the brackets ryt
(1-tanx)^2 = 1-2tanx + tan^2 x

ohhh crap !! .. I'm so sorry after tomorrow is the exam and I'm so nervous :3

 

[Thought blocker]

its ok blocky... once upon a tym even we dint know how to do it

We?

 

[Rutzaba]

ohhh crap !! .. I'm so sorry after tomorrow is the exam and I'm so nervous :3

its ok baby

 

[Rutzaba]

We?

we as in the entire maths student population...

 

[Haya Ahmed]

Sup Thought blocker how is life .. since long time no questions .. did you finish school ?!

 

[Thought blocker]

we as in the entire maths student population...

I am excluded.

 

[Thought blocker]

Haya Ahmed Everything remains same. A levels dont leave me.

 

[Evil Philanthropist]

https://files.cie.org.uk/tss/50630d...317/54330632/file/75/74475/S14_9709_qp_13.pdf

Can someone help me with Q7?
I am certainly sure that the answers of this particular question in the ms is wrong. So can someone please tell me the correct answer?

 

[Dynamite]

https://files.cie.org.uk/tss/50630d...317/54330632/file/75/74475/S14_9709_qp_13.pdf

Can someone help me with Q7?
I am certainly sure that the answers of this particular question in the ms is wrong. So can someone please tell me the correct answer?

same prob here , dont knw how did they get the value for AB as 4i -2j 4k while i m getting -2i -2j 4k ???? i believe that the question is wrong ...

 

[Thought blocker]

https://files.cie.org.uk/tss/50630d...317/54330632/file/75/74475/S14_9709_qp_13.pdf

Can someone help me with Q7?
I am certainly sure that the answers of this particular question in the ms is wrong. So can someone please tell me the correct answer?

same prob here , dont knw how did they get the value for AB as 4i -2j 4k while i m getting -2i -2j 4k ???? i believe that the question is wrong ...

That's what we are discussing from yesterday. Question is wrong, position vector of b should be (6, -1, 7)

 

[Altamash Haroon]

Can anyone please solve this question for me?

 

[Altamash Haroon]

Part i and iii only!

 

[Thought blocker]

View attachment 47850 View attachment 47849

Can anyone please solve this question for me?

i)
If Two Vector A and B are collinear (on the same line).. then Vector B = k(Vector A)

OA = (p, 1, 1) OB = (4, 2, p)

Comparing the j coefficents ..

OB = k(OA)
2 = k(1)
k=2

now compare either of the first or last to get p... Like comparing the first one we get

OB = k(OA)
OB = k(OA)
4= 2(p)
p=2 Answer

Unit vector in direction of OA vector :¬
As we know P = 2, hence, OA vector = (2, 1, 1)
So, 1/roof(2^2 + 1^2 + 1^2) = 1/root(6)


iii)
What you dont get in this? Simply do OB - OA.

 

[Altamash Haroon]

Tha

i)
If Two Vector A and B are collinear (on the same line).. then Vector B = k(Vector A)

OA = (p, 1, 1) OB = (4, 2, p)

Comparing the j coefficents ..

OB = k(OA)
2 = k(1)
k=2

now compare either of the first or last to get p... Like comparing the first one we get

OB = k(OA)
OB = k(OA)
4= 2(p)
p=2 Answer

Unit vector in direction of OA vector :¬
As we know P = 2, hence, OA vector = (2, 1, 1)
So, 1/roof(2^2 + 1^2 + 1^2) = 1/root(6)


iii)
What you dont get in this? Simply do OB - OA.

Thanks a ton!!

 

[♣♠ Magnanimous ♣♠]

All the best to all of the members who have exam tomorrow!
Write exam well and get good grades
Don't be nervous! Calm down and I think the day before papers should be enjoyment so that our mind get fresh and we don't get confuse in formulas and bla bla bla bla