C2 Official thread

[Yomna ElHabiby]

Do we have to use a black pen or is it ok to use a blue pen?? anyone??

 

[r97]

black pen

 

[xainer]

Remember: Sin(2π/3) = Sin(π − π/3) = Sin(π/3) = √3/2
Area = (½) * a * b * SinC
Area = ½ * 6 * 6 * Sin(2π/3)
Area = 36/2 * √3/2
Area = (36√3)/4
Area = 9√3

So sin(pi/3) is root 3 by 2 and why did u write sin (2pi/3) as root 3 by 2?

 

[Yomna ElHabiby]

I wrote with a blue pen in C1 and M1, so am I getting a U ??? :/ Non of the invigilators told us to write with a black pen

 

[Lilpumpkin]

i wrote blue in chemistry unit 3,,,so is it considered as a U???

 

[cardude456]

I wrote with a blue pen in C1 and M1, so am I getting a U ??? :/ Non of the invigilators told us to write with a black pen

i wrote blue in chemistry unit 3,,,so is it considered as a U???

i think if its dark enough........it'll be fine Not 100% sure though

 

[Lilpumpkin]

what do you mean dark enough? dark enough to be seen as like black color? or dark enough to be seen by blue?

 

[Ayesha B]

what do you mean dark enough? dark enough to be seen as like black color? or dark enough to be seen by blue?

I think its dark enough to be seen on their scanned version.

 

[Lilpumpkin]

i wrote with blue ball pen

 

[Ayesha B]

Naah man, geometric sequences is simple. Trigonometric identity and equations i much more confusing

Hmm, I guess. Geometric sequences annoy me cuz they're so wordy. and then I mess them up. But trig's alright if you know the two main identities. It just takes a little while to figure out

 

[Hamzeh S]

blue or black doesnt matter i wrote some january exams in blue ink and all my o level in blue doesnt matter

 

[Hadi Murtaza]

So sin(pi/3) is root 3 by 2 and why did u write sin (2pi/3) as root 3 by 2?

Both r equal to √3/2

 

[Lilpumpkin]

the line 4x-3y-40=0 touches the circle (x-2)^2+(y-6)^2=100 at P(10,0).show that the radius P is perpendicular to the line.
anyone explain this,i seem to confuse here alot,and i hate this chapter :/

 

[Hamzeh S]

the line 4x-3y-40=0 touches the circle (x-2)^2+(y-6)^2=100 at P(10,0).show that the radius P is perpendicular to the line.
anyone explain this,i seem to confuse here alot,and i hate this chapter :/

well the center is 2,6 (from the equation)
now find the gradients of radius p 6-0/2-10 = -6/8 or -3/4
now gradient of the line 4x-3y-40=0 arrange it so that y is the subjecct
3y=4x-40
y=4/3x-40/3
so gradient of this line is 4/3

4/3 * -3/4 = -1 so they are perpendicular

 

[ahmed soliman]

jan 10 q7 part d) ??

 

[ammar.danish1]

please find me some

Okay guys this might help but not much!

 

[ahmed soliman]

thx a lot, it really helped me but u forgot to say 0.5 because it is area of triangle !! really hope I get A this time and good luck

well first find the area of triange L N N'
so x cordinate of N - x cordinate of L *4 = area of the triangle
then u gotta deduct the area under the graph from M to N ( x cordinate)
so integerate the graph from M to N ( x- coordinate) and then deduct this value from the value of area of triangle
good luck

 

[r97]

Guys i need help!! in jan 2011 q:9 which two points should we use??

 

[Hadi Murtaza]

Guys i need help!! in jan 2011 q:9 which two points should we use??

Which part ??

 

[kcapfootball]

guys what other proof except for the sum formula shoold we know for c2?