Mathematics: Post your doubts here!

[Rutzaba]

Aslamoalikum
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_12.pdf
Q9 (ii) adn Q 11 (i) and (iii)

this is so very easy.. al you have to kp in mind that the gradient of tangent is also gradient og curve at aprticular point they meet. curve =9/2x+3
differentiate you will get -9/ (2x+3)^2
since its tangent at A x=3
-9 /( 81)
grad = -1/9
now u make an equation with coords 3,1 and grad = -1/9
then u get eq of line 9y= -x+12
notice that C lies on this line... hence to take out coords of C put x=0 as it lies on the y axis
u will get points (0, 4/3)
now take distance of C (0, 4/3) and O ( 0, 0)
and distance C(0, 4/3) and B (0, 3)
the lesser the distance the closer the points are...
the formula of distance is root of (((x1-x2)^2 +(y1- y2)^2))

 

[Rutzaba]

hey guys check 11 part i
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w12_qp_12.pdf

 

[PhyZac]

I was going through this again and failed to understand something.. does it matter where the curve cuts the x-axis in the final shape? Like in your case, it cuts slightly after π/2..

Well, I usually pay attention to x-axis, and as PANDA- said, easily by replacing y=0, the thing is, i forgot to do that when I replied to you.
To be safe side, do consider the x-axis.

 

[A star]

hey guys check 11 part i
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_12.pdf

easy
we can see that OQ= 20 hence Oc= 20-x
sin(0.6)=x/OC
equate both and get the answer

 

[PhyZac]

hey guys check 11 part i
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_12.pdf

You made tensed seeing you post.

 

[PANDA-]

hey guys check 11 part i
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_12.pdf

OR is a tangent to the circle inside at point R... So angle ORC = 90. That's something, lol still thinking

 

[Rutzaba]

ahahahah i was tensed k i cant solve such an easy questions... actually i have phy practicl on my mind... not my best subject :'(

 

[Rutzaba]

OR is a tangent to the circle inside at point R... So angle ORC = 90. That's something, lol still thinking

i tried that frst xD

 

[A star]

ahahahah i was tensed k i cant solve such an easy questions... actually i have phy practicl on my mind... not my best subject :'(

well i have both practicals and computing on my mind

 

[Rutzaba]

well i have both practicals and computing on my mind

but the thing is that i had no phy in alevels ... had it only in o and straight to uni phy, although its not a major... but still
i like phy jab tak practicals na hon -_-

 

[A star]

but the thing is that i had no phy in alevels ... had it only in o and straight to uni phy, although its not a major... but still
i like phy jab tak practicals na hon -_-

well it doesnt matter they do teach the basics in uni i guess :/
O are uni practicals hard :/

 

[Rutzaba]

they arent hard... but u need to have interest and u need to do it to aactually know it xD i used to sit back and enjoy lunch while my group member frends did the wrk

 

[Rutzaba]

and sussenly u have to do the practical all by ur self... seven pac revision in one day not to mention a viva that follows...andi also may have stats viva tommz but stats is bearable at uni level.. cux of so many vivas we have gud practice...

 

[A star]

they arent hard... but u need to have interest and u need to do it to aactually know it xD i used to sit back and enjoy lunch while my group member frends did the wrk

then i am glad we ha to single practicals the chem practicals seem fun at the start but physics seem borign from first day . sats viva ?

 

[Rutzaba]

we had alternate to practicals in o levels.. chemistry be love but only till the atps -_-

 

[Rutzaba]

cux it used tob sooooooooooooooooo easy

 

[A star]

i also had atps in O level started practicals this year

 

[Rutzaba]

lets not go off topic now

 

[salvatore]

According to the ms, no. But it would make your graph more accurate I guess.... and it's very simple, just replace y=0 and solve the eqn.

Well, I usually pay attention to x-axis, and as PANDA- said, easily by replacing y=0, the thing is, i forgot to do that when I replied to you.
To be safe side, do consider the x-axis.

So in this case its 1.966 radians => approx. 2/3π ? We just estimate the point on the graph right?

 

[Rutzaba]

then i am glad we ha to single practicals the chem practicals seem fun at the start but physics seem borign from first day . sats viva ?

hey wat was the frmula of finding acute angel between two tangents?