Mathematics: Post your doubts here!

[zarasattar]

Have you expanded cos(3x − x) and cos(3x + x) ???

oh wait, i think i know how to do it

 

[smzimran]

yep i have!

Substitute cos(3x − x) in place of cos2x and cos(3x + x) in place of cos4x​

 

[hassam]

yea 32 As the series is infinite it can only converge if -1 < x < 1

By the ratio test, it follows that the series converges for |x|<1, diverges for |x| > 1.​

i read this from forums.....now having read tthis ......do u get any idea on validity cos i dint still get it why we wud want it to cnverge or diverge

 

[smartangel]

http://www.xtremepapers.com/community/attachments/sketching-argand-diagrams-2-pdf.6340/
Have you seen these ?

no..im just checking it out and i'll see if it answers my question.. also one more thing do we have to roughly sketch argand diagrams or does it have to be proper..like radius and all? and is it on our answer booklet or graph paper?

 

[smzimran]

smartangel and 1357913579:

smartangel:
No accuracy is not needed, its just 'SKETCHING'

 

[Mustehssun Iqbal]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_31.pdf
Q 10 b please!

Ooh. Apologies. I misread your post. :/
I want the solution to that question too....

 

[smzimran]

Ooh. Apologies. I misread your post. :/
I want the solution to that question too....

Ohk, i'll solve it!

 

[zarasattar]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_qp_31.pdf
Q 7 iii ?

 

[smzimran]

zarasattar and Mustehssun Iqbal:

 

[zarasattar]

zarasattar and Mustehssun Iqbal:
View attachment 9720

Thanks!

 

[smartangel]

does anyone have all the trignometric graphs? and exponential graphs as well?

 

[Mad-Eye]

A 'Permutation and Combination' problem
Eight cards are selected from a pack of 52 cards, with 12 picture cards, 20 odd cards and 20 even cards.
How many sequences of eight cards will contain 3 picture cards, 3 odd numbered cards and 2 even numbered cards??

 

[hassam]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s11_qp_32.pdf​

q10 part 3​

 

[hassam]

A 'Permutation and Combination' problem
Eight cards are selected from a pack of 52 cards, with 12 picture cards, 20 odd cards and 20 even cards.
How many sequences of eight cards will contain 3 picture cards, 3 odd numbered cards and 2 even numbered cards??

yar p3 ka paper hay aaj

 

[user]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_32.pdf​

q10 part 3​

Assalamoalaikum wr wb!

now if the tangent passes through the origin [and since it's a straight line..] the eqn of the tangent will be in the form y= mx where m is the gradient and therefore dy/dx

solve this equation and the equation of the curve simultaneously and find x

 

[zarasattar]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_qp_31.pdf
Q 7 iii ?

 

[user]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_qp_31.pdf
Q 7 iii ?

use pythagoras theorem
r--> radius..

 

[hm12]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s11_qp_31.pdf
question 4 part (ii) please someone help quickly

 

[user]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_31.pdf
question 4 part (ii) please someone help quickly

Put x = 3^y and u'll get the eqn similar to the one above...!

u know the values of x ...so put 3^y = that value...
2 of them can not be solved...find the answer..
27^y = (3^3)^y =3^3y = x^3

 

[hm12]

Put x = 3^y and u'll get the eqn similar to the one above...!

u know the values of x ...so put 3^y = that value...
2 of them can not be solved...find the answer..
27^y = (3^3)^y =3^3y = x^3

thanks a lot