• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Mathematics: Post your doubts here!

ZaqZainab

ZaqZainab

Messages
1,764
Reaction score
3,472
Points
273
Thought blocker said:
HOW TO DO THIRD PART ?
Click to expand...
kitkat <3 :p said:
Can It be cos(k) ...thats the only thing tht comes in my mind :"/
Click to expand...
sorry for the late reply went for lunch
sinx=??
we know tanx=sinx/cosx
so sinx=tanx*cosx
square all the terms
sin^2 s= tan^2 x * cos^2 x
tanx=k
so tan^2 x= k^2
and cos^2(x)=1-sin^2 x
sin^2 x = k^2 *(1-sin^2x)
sin^2 x= k^2-(k^2*sin^2 x)
sin^2x + (k^2*sin^2 x)= k^2
sin^2 x (1+k^2)=k^2
sinx= root of(k^2 /(1+k^2))
sinx= k/root of(1+k^2)
 
ZaqZainab

ZaqZainab

Messages
1,764
Reaction score
3,472
Points
273
M Haseeb Javed said:
View attachment 40518

Part iii and iv ??
Click to expand...
iii) its hard to find the number of different arrangements which do not have all 4 vowels (E, E, A, E) next to each other directly so we will find all the possible arrangement which DO have 4 vowels next to each other first (E,E,A,E) can be placed in 8 different places
So (8!*4!)/(2!*2!*3!)=40320
and now find the total number of different arrangements
it will be (11!/3!*2!*2!)=1663200
1663200-40320= 1622880
iv)no Rs and no Ms
leave us with 7 letters
and at least 2 means either 2 or 3
now we have already take 2 E(s) we need 2 more letter (other than E) to get total of 4
4C2
now if we take all 3 E(s) we need 1 more to get total of 4
4C1
4C2+4C1=10
 

Attachments

  • upload_2014-4-29_16-5-26.png
    upload_2014-4-29_16-5-26.png
    5.8 KB · Views: 0
K

kitkat <3 :P

Messages
616
Reaction score
2,961
Points
253
ZaqZainab said:
sorry for the late reply went for lunch
sinx=??
we know tanx=sinx/cosx
so sinx=tanx*cosx
square all the terms
sin^2 s= tan^2 x * cos^2 x
tanx=k
so tan^2 x= k^2
and cos^2(x)=1-sin^2 x
sin^2 x = k^2 *(1-sin^2x)
sin^2 x= k^2-(k^2*sin^2 x)
sin^2x + (k^2*sin^2 x)= k^2
sin^2 x (1+k^2)=k^2
sinx= root of(k^2 /(1+k^2))
sinx= k/root of(1+k^2)
Click to expand...
Thank u :)
 
Thought blocker

Thought blocker

Messages
8,477
Reaction score
34,837
Points
698
Wolfgangs said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_12.pdf

I noticed that in many papers, many questions like Q1 come. How to solve such questions. Please reply as soon as possible
Click to expand...
ZaqZainab said:
There are this formulas
this might help
2014-04-13-21-20-06-jpg.40515
Click to expand...
:)
 
Rutzaba

Rutzaba

Messages
4,493
Reaction score
15,418
Points
523
Wolfgangs said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_12.pdf

I noticed that in many papers, many questions like Q1 come. How to solve such questions. Please reply as soon as possible
Click to expand...
bhai dekho
if cos x= p
cos^2 x= p^2
1- cos^2 x= 1- p^2
sin^2 x= 1-p^2 <---- cos square plus sin square =1
sin x= root of 1- p^2

second part
tan= sin/cos
see sin in terms of p divided by cos in terms of p
tan x=(root of 1- p^2)/p
 
Rutzaba

Rutzaba

Messages
4,493
Reaction score
15,418
Points
523
ZaqZainab said:
:3 my teacher gave those maybe there is another method but this is the shortest you just 1 mark so they don't expect you to show working for this kind of equation
Click to expand...
id rather do it the hard way than to rote learn formulas :/
 
You must log in or register to reply here.
Top