Mathematics: Post your doubts here!

[PANDA-]

double derivate was not required in this question .... actually double derivate is just used to tell the nature the of the function ... however i wanted minimum vale dy/dx ... take it this way
you have to find minimum value of the function f(x) = 3x^2 -8x +4

You can find it in two ways either express it in (x-h)^2 +k form where k will be the minimum value
or
just derivate the function and equate it to zero to get the x-cordinate of the minimum point .. and then insert that value of x in the minimum value of the function..

it just happend to be that f(x) that we are talking about was dy/dx ... so derivative of that function was double derivative ..

Hope i m clear..

Nature of the stationary point*.

 

[MustafaMotani]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_11.pdf
Question 1, all of it.

i posted this before as well

 

[MustafaMotani]

Nature of the stationary point*.

u got me there.. XD

 

[PANDA-]

i posted this before as well

Honestly I don't get it fully.
I get that tanx = ab/bc (duh! )
But further.. not really.

 

[MustafaMotani]

Honestly I don't get it fully.
I get that tanx = ab/bc (duh! )
But further.. not really.

triangle is just used for sin x
AC is calculated by pythagoras theorem

first two part, i recommend yu learn it tan(pi-x) = -tanx and tan(0.5pi-x) = 1/tanx

if yu want to know how ... i would be happy to tell you.. there logic lies in tan graph...

 

[PANDA-]

triangle is just used for sin x
AC is calculated by pythagoras theorem

first two part, i recommend yu learn it tan(pi-x) = -tanx and tan(0.5pi-x) = 1/tanx

if yu want to know how ... i would be happy to tell you.. there logic lies in tan graph...

I think I understand tan(pi-x) = -tanx in relation to the graph...
Is it because every pi units the graph is upside down, like at tan(x) it would be going up and at tan(pi-x) it would be going down. Just a logical guess.

 

[MustafaMotani]

I think I understand tan(pi-x) = -tanx in relation to the graph...
Is it because every pi units the graph is upside down, like at tan(x) it would be going up and at tan(pi-x) it would be going down. Just a logical guess.

ur guess is ryt .. just to be confidence yu can practically try it ...

 

[PANDA-]

ur guess is ryt .. just to be confidence yu can practically try it ...

Wow really?
Too bad I can't make such conclusions in an exam, I get so tense.

 

[MustafaMotani]

Wow really?
Too bad I can't make such conclusions in an exam, I get so tense.

I know its messed up but i think u can get it..

 

[Hamza1996]

question 8 part 3 nov 2012 variant 13

 

[MustafaMotani]

p1 any one plz solve question 8 part 3

its chem bro..

 

[PANDA-]

I know its messed up but i think u can get it..

Yes I do get the tan(pi-x)... But not the tan(0.5pi-x)

 

[MustafaMotani]

Yes I do get the tan(pi-x)... But not the tan(0.5pi-x)

sin x = cos (90-x)
cos x = sin (90-x)

tan(0.5pi-x) is same as tan (90-x)

tan (90-x) = sin(90-x)/cos(90-x)
= cos x/ sin x
= 1/tanx ..

hope it helps

 

[Hamza1996]

its chem bro..

HERE U GO

 

[Hamza1996]

its chem bro..

THE VALUE OF C IS NT COMNG RITE WEN M SOLVING IT!!!!

 

[MustafaMotani]

HERE U GO

just integrate dy/dx
u shall get
y= 4(3x+4)^2.5/15 -3x^2 - 8x + C

to get value of c just insert (-1,5) in the places of x and y respectively

 

[MustafaMotani]

mine is coming -4/15
wats urs..?

 

[Manobilly]

THE VALUE OF C IS NT COMNG RITE WEN M SOLVING IT!!!!

The c value is -4/15

 

[MustafaMotani]

The c value is -4/15

yup thats what i got ... u might have been integratimg incorrectly... refer to my last post i have integrated

 

[sma786]

for these type of equations use this formulae
NCr (a)n-r br equate their powers like -1=5-r-r this means r=3 solve it with this value

i dint get your formula