c3 trig

[Ayesha B]

Hadi Murtaza your solution?

 

[urwahboy]

But waiiiit, if you wanna differentiate lnx isnt the rule

f '(x)/f(x) ??!

Keith Pledger book page 140!!!

lol i know that rule....
ops sorry i made a mistake it should be cos2x/(1+sin2x)... actually i could guide u through the whole process but its hard to write these things here

 

[Ayesha B]

lol i know that rule....
ops sorry i made a mistake it should be cos2x/(1+sin2x)... actually i could guide u through the whole process but its hard to write these things here

Yeah ikr! Math seems like astrophysics when you type it out! lol

 

[urwahboy]

Yeah ikr! Math seems like astrophysics when you type it out! lol

lol yep

 

[Ayesha B]

Manasa I did q8 in the june 13 paper

Okay so you asked for last two parts right?

(c) Just use the sine rule --> you'll have AB/sin90 = 7/sintheta. You found theta in part (a) so use that value. Simple Algebra and voila, you're done

(d) Okay this is very simple too and nothing new! Basically they're changing the speed right, so they're changing V

Now, follow the steps:

V = 21 / (24sintheta + 7costheta)
You expressed the denominator in the form Rcos(theta -alpha) so replace it

V = 21/ (Rcos(theta - alpha)) [sidenote: put in your answers for R and alpha, I didnt actually solve the ques lol]
Then sub in 1.68 instead of V

1.68 = 21/ (Rcos(theta - alpha))
Cross Multiply

Rcos(theta - alpha) = 21/1.68 = 12.5

Then just do your normal solving thing!

cos(theta - alpha) = 12.5/R and so on

 

[Hadi Murtaza]

But waiiiit, if you wanna differentiate lnx isnt the rule

f '(x)/f(x) ??!

Keith Pledger book page 140!!!

yup dats da rule

 

[Hadi Murtaza]

Hadi Murtaza your solution?

of wat ?

 

[Ayesha B]

of wat ?

that question. Anyway, guys, how was it? esp the GCE one? What did you guys think of it?

 

[St0cK]

The GCE was hard... Q9 last 2 parts were hell haha, it's definitely harder than older papers, except June 2013, this one is easier but not by much...

i think the A will be 57

 

[Hadi Murtaza]

that question. Anyway, guys, how was it? esp the GCE one? What did you guys think of it?

I thought there were 8 questions -___________-
left da 9th 1 by mistake

 

[Ayesha B]

I thought there were 8 questions -___________-
left da 9th 1 by mistake

:/ but you prolly got the other 8 spot on so its okay

 

[Hadi Murtaza]

:/ but you prolly got the other 8 spot on so its okay

I wanted n A* in maths
How wuz ur ppr ?

 

[Ayesha B]

I wanted n A* in maths
How wuz ur ppr ?

I also wanted an A*.

Let's just leave it there.

 

[Manasa]

I also wanted an A*.

Let's just leave it there.

how much do u think ull get outta 75/?

 

[Mufaddal]

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