Mathematics: Post your doubts here!

[ali raza khan]

its the normal vector dr

thankyou for the help guys ... best of luck for ur exam...

 

[RoOkaYya G]

its the normal vector dr

ohh!! the n hat ok

 

[Belleflower101]

How was the exam ? Paper 3?

 

[Nazree]

Can any of you guys recall some of the questions for today's paper 3? Especially the differential equations. I want to redo.
The paper was very easy anyway~

 

[Haya Ahmed]

how to find dy/dx of this

e^xy = 4

the answer is -y/x ... I need steps thanks

 

[RoOkaYya G]

Can any of you guys recall some of the questions for today's paper 3? Especially the differential equations. I want to redo.
The paper was very easy anyway~

paper discussion after 24 hours. else ull be banned immediately.
u can say the answers only but not question with answer.

 

[RoOkaYya G]

how to find dy/dx of this

e^xy = 4

the answer is -y/x ... I need steps thanks

the xy is the power or only the x?

 

[RoOkaYya G]

how to find dy/dx of this

e^xy = 4

the answer is -y/x ... I need steps thanks

take ln on both side
xy lne = ln 4
xy= ln 4

dy/dx :
using product rule :
u=x
du = 1
v=y
dv= 1* dy/dx (implicit)

dy/dx = vdu + udv
=x * (dy/dx) + y

NOTE THAT ln4 when differenciated becomes zero

x * (dy/dx) = -y
dy/dx = -y/x <----------here u go! ^_^

 

[Donald Don]

How was the exam ? Paper 3?

horrible i got 96 in As and now im screwed..

 

[Donald Don]

it

Can any of you guys recall some of the questions for today's paper 3? Especially the differential equations. I want to redo.
The paper was very easy anyway~

wasnt very very easy there are papers faaaar more easier than todays...

 

[RoOkaYya G]

it

wasnt very very easy there are papers faaaar more easier than todays...

true tht

 

[Haya Ahmed]

i need help
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s03_qp_3.pdf
Q.6 part ii


RoOkaYya G

Pleaaaaaaaaaaase Help !!

 

[Camille96]

That paper 3 was hell. Gosh, i wonder how i'll get A in maths. How was the paper btw, guys?

 

[Camille96]

How was the exam ? Paper 3?

Not okay

 

[Saad Amjad.]

i did around 8 years of question papers and practiced a lot..but never found a paper as weird and difficult as today's...i expect to get around 50..what do you think of the grade threshold guys??..or is it just me who did so bad??

 

[Camille96]

i did around 8 years of question papers and practiced a lot..but never found a paper as weird and difficult as today's...i expect to get around 50..what do you think of the grade threshold guys??..or is it just me who did so bad??

You're not the only one. I was dumbstruck

 

[geni0usheeni]

the paper wasnt that easy.... it was damn tricky n confusing.. the grade threshold shud be lessened... im nt sure if i'll be able to get the A..

 

[bludlynsolja]

Yeah Man U r absolutely right!!
This paper was on a league of its own!
for me time was a big issue as I had to forgo soo many questions.
Bt inshaAllah God helps us man!!
And I must admit I didn't work as hard as I would have liked so just praying to God without effort won't help but I hope it does!!!

 

[priya_sharma]

guyzz u r tokin abt paper 32?

 

[perpetuallystressed]

Paper wasn't that easy... I'm worried sick. I practiced so hard for Math, was aiming for an A*...