Mathematics: Post your doubts here!

[itallion stallion]

how to integrate cos2A/sin2A?

Integrate simple cosA and then divide it by the derivative of the left part like 2A in this.so it will be sin2A/2.

 

[psychiatrist]

I am very dull at maths............................pls smeone hlp me out

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??

 

[moonangel996]

.

can you help me with these doubts please ??

1) http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_31.pdf Question 9
2) http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_31.pdf Question 7
3) http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_33.pdf Question 8 and 10
i need help please its urgent and iam really scared . Thank you in advance

 

[David Hussey]

??

7)
to find c, u use your line AC equation
at C, X=0, so find Y using this
same thing for B, X=0, but sub it in your curve equation

 

[David Hussey]

Integrate simple cosA and then divide it by the derivative of the left part like 2A in this.so it will be sin2A/2.

could u show the working?

 

[David Hussey]

??

question 2 use the normal formula you get in the formula sheet
maybe 3/x is confusing you, you can write it as 3x^-1

q4
u find those two points by simultaenoues equation
integrating 6x-x^2 with those x points you got as the boundaries
the area you get minus it with the area of the rectangle

 

[Tanvir Azad]

Question is: State what happens to the value of N when t becomes very large?

 

[David Hussey]

Question is: State what happens to the value of N when t becomes very large?

m not sure if i am right
but take an eg
when t=2
n=633

t=100
n=1800
so increasing, is it correct?

 

[immie.rose]

Need help!

 

[itallion stallion]

can you help me with these doubts please ??

1) http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_31.pdf Question 9
2) http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_31.pdf Question 7
3) http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_33.pdf Question 8 and 10
i need help please its urgent and iam really scared . Thank you in advance

3)

 

[itallion stallion]

3)

Sending rest!connection speed to damn slow!

 

[David Hussey]

Need help!
View attachment 40193

is the answer
-1/3 ln(3X+1)

 

[SitiPutri]

??

These questions should be very easy if you already grasp the basic concept btw. Try to just understand the basics and questions like these will be so easy to tackle.

For question no. 1 use the formulas I posted here:

Formula

 

[immie.rose]

is the answer
-1/3 ln(3X+1)

It's 1/3(3x+1)-1/3ln(3x+1) actually. =[

 

[immie.rose]

I obtained the following, as stated in the ms, but can't proceed further. Help, anyone?

 

[immie.rose]

 

[moonangel996]

3)

Thank you , but for ques 8 part (ii) the answer is not zero can u check it please ??
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_ms_33.pdf

 

[moonangel996]

3)question 10View attachment 40199View attachment 40200

omg i did nt get this too and i cant find the attachment for part (i) and part (ii) a
can u check your answer to part (ii) b because the right answer is 25/24
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_ms_33.pdf Question 10
Thank you

 

[Thought blocker]

I am very dull at maths............................pls smeone hlp me out

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Full paper solved mehria ZaqZainab
Correct me please

 

[Talha Irfan]

U are considering that there are two chemicals only that should be placed on the four positions.but when we are arranging the rest we are placing two more on those 4 places!

please elaborate with calculation/example if you can (that is, where am i going wrong in my approach)