Mathematics: Post your doubts here!

[sma786]

no problemo butt ummm *ahem ahem not a boy ahe ahem*

Thnku*girl and a boy sorry for that

 

[sma786]

http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_s03_qp_1.pdf
Ok so in question 1, the markscheme says they take the 4th term, why? (1/x) comes when 5C1 ryt, thats where there comes (1/x) so why the 4th term?!

 

[daredevil]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s03_qp_1.pdf
Ok so in question 1, the markscheme says they take the 4th term, why? (1/x) comes when 5C1 ryt, thats where there comes (1/x) so why the 4th term?!

no u got that wrong..... see that x is in both the values 2x and 1/x also ..... now do it

 

[Maz]

can you tell me how to make Q7 iii pls

since g(x) = x-2
and hg = f
replace the "g" part in "f" by x.
You get h(x) = x^2 +3

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s03_qp_1.pdf
Ok so in question 1, the markscheme says they take the 4th term, why? (1/x) comes when 5C1 ryt, thats where there comes (1/x) so why the 4th term?!

for these type of equations use this formulae
NCr (a)n-r br equate their powers like -1=5-r-r this means r=3 solve it with this value

 

[PANDA-]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_11.pdf
Question 1, all of it.

 

[shafayat]

agh.. I am tensed :/ I DONT FUKIN WANNA BE ....UGHHH

 

[shafayat]

yeah but in (ii) It's asking about a different equation , not the one i already sketched. and it's for one mark , do i have to sketch that as well?

NO... so u didn't get what I said
after the first question .. u found there are 2 solutions for one revolution, (I.e. 0- 2pie) den u find how many of these 0-2pie revolutions are there in 0-20pie ! .. there are 10 of these revolution right ? ... so if one 0-2pie revolution has 2 sol how many does 10 revolutions have ? 20 !!!!

 

[MustafaMotani]

thanks al


Thanks alot many thanks but can u just tell me when is it necessary for us to double derivate it and put it equal to zero ?

double derivate was not required in this question .... actually double derivate is just used to tell the nature the of the function ... however i wanted minimum vale dy/dx ... take it this way
you have to find minimum value of the function f(x) = 3x^2 -8x +4

You can find it in two ways either express it in (x-h)^2 +k form where k will be the minimum value
or
just derivate the function and equate it to zero to get the x-cordinate of the minimum point .. and then insert that value of x in the minimum value of the function..

it just happend to be that f(x) that we are talking about was dy/dx ... so derivative of that function was double derivative ..

Hope i m clear..

 

[PANDA-]

double derivate was not required in this question .... actually double derivate is just used to tell the nature the of the function ... however i wanted minimum vale dy/dx ... take it this way
you have to find minimum value of the function f(x) = 3x^2 -8x +4

You can find it in two ways either express it in (x-h)^2 +k form where k will be the minimum value
or
just derivate the function and equate it to zero to get the x-cordinate of the minimum point .. and then insert that value of x in the minimum value of the function..

it just happend to be that f(x) that we are talking about was dy/dx ... so derivative of that function was double derivative ..

Hope i m clear..

Nature of the stationary point*.

 

[MustafaMotani]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_11.pdf
Question 1, all of it.

i posted this before as well

 

[MustafaMotani]

Nature of the stationary point*.

u got me there.. XD

 

[PANDA-]

i posted this before as well

Honestly I don't get it fully.
I get that tanx = ab/bc (duh! )
But further.. not really.

 

[MustafaMotani]

Honestly I don't get it fully.
I get that tanx = ab/bc (duh! )
But further.. not really.

triangle is just used for sin x
AC is calculated by pythagoras theorem

first two part, i recommend yu learn it tan(pi-x) = -tanx and tan(0.5pi-x) = 1/tanx

if yu want to know how ... i would be happy to tell you.. there logic lies in tan graph...

 

[PANDA-]

triangle is just used for sin x
AC is calculated by pythagoras theorem

first two part, i recommend yu learn it tan(pi-x) = -tanx and tan(0.5pi-x) = 1/tanx

if yu want to know how ... i would be happy to tell you.. there logic lies in tan graph...

I think I understand tan(pi-x) = -tanx in relation to the graph...
Is it because every pi units the graph is upside down, like at tan(x) it would be going up and at tan(pi-x) it would be going down. Just a logical guess.

 

[MustafaMotani]

I think I understand tan(pi-x) = -tanx in relation to the graph...
Is it because every pi units the graph is upside down, like at tan(x) it would be going up and at tan(pi-x) it would be going down. Just a logical guess.

ur guess is ryt .. just to be confidence yu can practically try it ...

 

[PANDA-]

ur guess is ryt .. just to be confidence yu can practically try it ...

Wow really?
Too bad I can't make such conclusions in an exam, I get so tense.

 

[MustafaMotani]

Wow really?
Too bad I can't make such conclusions in an exam, I get so tense.

I know its messed up but i think u can get it..

 

[Hamza1996]

question 8 part 3 nov 2012 variant 13

 

[MustafaMotani]

p1 any one plz solve question 8 part 3

its chem bro..