Mathematics: Post your doubts here!

[falcon678]

wat im asking you ppl to do ... is to remain on topic... im not ussually this harsh... but exams are just on head and this place shud remain as on topic as it cud be... agreed frends? i apologize fr my rude behaviour!

ah well i gues presure is geting to us n makes me atleast go as if i lost a screw or two....so well umm sorry...

 

[gary221]

guys... help pls!!!
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s09_qp_3.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s09_ms_3.pdf

ques 2
thnx!!

guys pls!!

 

[falcon678]

n yeah guys..... question 2 as well....i just cant do it.....

 

[MustafaMotani]

falcon678 calc dy/dx then solve
dy/dx < 0
yu will probably end up with x>0 (shown)

explanation for increasin function dy/dx >0
for decreasing function dy/dx < 0

 

[Rutzaba]

ah well i gues presure is geting to us n makes me atleast go as if i lost a screw or two....so well umm sorry...

koi bt nhi hojata hai

guys pls!!

u have maths? ohkay

 

[MustafaMotani]

gary221 do you know trapezium rule or is it that u are facing prob with this particular question..?

 

[daredevil]

falcon678 calc dy/dx then solve
dy/dx < 0
yu will probably end up with x>0 (shown)

explanation for increasin function dy/dx >0
for decreasing function dy/dx < 0

oh that's a tough one... can u like solve it totally bcz i'm not sure i ever covered this concept :O

 

[gary221]

gary221 do you know trapezium rule or is it that u are facing prob with this particular question..?

i know the rule... just hv prob wth d application part!!
its just this ques!!

u have maths? ohkay

haan...

 

[MustafaMotani]

daredevil well if yu ask for concept...

see function is increasing if value of y increases as you go across x axis ... for this to happen the gradient of the function has to be positive thus greater than zero..
twll me if yu dont get it

 

[MustafaMotani]

gary221 three intervals are 0, pi/8, pi/4

u have to ensure that d is constant

 

[syed1995]

wat im asking you ppl to do ... is to remain on topic... im not ussually this harsh... but exams are just on head and this place shud remain as on topic as it cud be... agreed frends? i apologize fr my rude behaviour!

I agree that this thread should be on topic as much as possible but sometimes I too get carried away sometimes.. haha

 

[Rutzaba]

I agree that this thread should be on topic as much as possible but sometimes I too get carried away sometimes.. haha

like right now

 

[gary221]

gary221 three intervals are 0, pi/8, pi/4

u have to ensure that d is constant

bt how did u gt tht???
i know m being a bother..bt i kinda suck at maths!!

 

[MustafaMotani]

gary221 lol no yu arent bother.. .. I just got it by looking at it... it said we have to do it in three intervals... we knw two values 0 and pi/4 ... so to get third just find the mid -value ..

 

[sma786]

This is CIE making life difficult for us...

To get the vectors we will find the unit vector and multiply by the magnitude..

OA = Unit Vector .. 3i − 4k/√25

15/5(3i-4k)
=3(3i-4k)
=9i-12k

Unit Vector of OB = 2i + 3j − 6k / √(2^2)+3^2+(-6^2)
Unit Vector of OB = 2i+3j-6k/7

OB = 14/7(2i+3j-6k)
OB = 2(2i+3j-6k)
OB = 4i+6j-12k

lol, thanks

 

[sma786]

shafayat look, i just took pi-2.4 that gave me 0.74 . but i have 2 angles that are similar, so answer/2 : 0.37
means each angle is 0.37 rads, then i just use the sin formula
sin0.37/8 = sin2.4/x
and i got the correct answer

 

[MustafaMotani]

falcon678 daredevil.. here is a snapshot of the graph in the question u gave .. i just pinned it for yur understanding.. there is nothing to do with the answer.. u can see as we go across x (after x>0) y is decreasing... tis we had to prove..

 

[syed1995]

falcon678 daredevil.. here is a snapshot of the graph in the question u gave .. i just pinned it for yur understanding.. there is nothing to do with the answer.. u can see as we go across x (after x>0) y is decreasing... tis we had to prove..

How did ya draw the graph?

 

[MustafaMotani]

syed1995
from graph plotter.. xD

 

[PANDA-]

How did ya draw the graph?

http://rechneronline.de/function-graphs/