(Original post by john1234567)
i'm not sure i agree with that. if cot2x = 0 then you should be able to put x=45 in and get 0
There's another way then:(Original post by MrBo)
I got the same first 2 solutions as this, but for the last ones i'm not too sure. Dosn't cotx have asymtotes every 90 plus/minus 180? So if this is true 2x can't equal either 45 or 135
That's equal to
Thus you get
and now that is definitelyand
Don't worry about it....like hardly any one got it so the grade boundaries would probably take off at least 2 marks to accommodate the loss
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Official Edexcel C3 Discussion Thread watch
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.:excel4100%:.
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Remarqable M
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- 21-01-2010 08:09
(Original post by john1234567)
just a few questions i remember
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this is the one with the minimum (a,b) and you have to find a and b, did anyone get the same as me?
so a = -0.196
then put x = -0.196 into the original equation to find b = 0.812
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graph of y = ln(|x|) was pretty simple, i checked on wolframalpha, got it right -
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- 21-01-2010 08:10
The exam was pretty easy, so easy that I ended up making some really silly mistakes, I think I forgot to put ln on both sides for the last question when taking logs to both sides. and I totally ****** up question one by not looking at it correctly, that's 4 marks gone.
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john1234567
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- 21-01-2010 08:11
(Original post by milliondollarcorpse)
I don't know how to differentiate arcsinx, lucky I still managed to do it anyway
(Original post by Remarqable M)
mate i think you got the 1/cosx wrong you can't use product rule here because it is constant/function and so need to use chain rule by taking the reciprocal of cosx -
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How On Earth Did I Get 1 Wrong!
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Remarqable M
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- 21-01-2010 08:18
(Original post by Arsey)
Very hard I thought. Here are my solutions
will i get mark??? -
alithegreat
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- 21-01-2010 08:19
In the graph for ln(mod(x)) if I have drawn only one part of the graph how many marks would i lose out of 3
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- 21-01-2010 08:22
That went so bad... i couldn't do most of the paper ... i am now dreading the results day
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- 21-01-2010 08:23
(Original post by alithegreat)
In the graph for ln(mod(x)) if I have drawn only one part of the graph how many marks would i lose out of 3 -
MIKE ESSIEN IS QUITE SICK
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- 21-01-2010 08:28
How did everyone find this exam.I just want to know if the general opinion was that it was hard or easy. I found the test quite hard...similar to c2 last june.
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ladythugette
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- 21-01-2010 08:30
I really hope the grade bondaries are low...I made so many silly mistakes
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- 21-01-2010 08:32
Ye it was a tough exam like C2 ... just hope the boundaries are low ...
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hammerhasni5
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- 21-01-2010 08:38
my mates who did it found it real easy.. but thats only cuz they had a friend from another school who finished the same exams half an hour earlier who gave them the questions!
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- 21-01-2010 08:43
(Original post by hammerhasni5)
my mates who did it found it real easy.. but thats only cuz they had a friend from another school who finished the same exams half an hour earlier who gave them the questions!. I made so many silly mistakes in my exam, i'm just hoping the grade boundaries are low-like they were for C2. However some people found the exam easier than C2, so you never know.
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abcdefghijklmnopqrstuvwxyz
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- 21-01-2010 08:49
Pretty easy
Got 97% worst case scenario -
kosy91
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- 21-01-2010 08:50
we all have different answers for number 8 and Q9 last part
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crazygirl29
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- 21-01-2010 08:51
(Original post by Arsey)
of course, so 45 and 135 will also work.
cosec^2x- cot 2x u dont get one. its maths error!! so it dont work
u cant have 1/ tan 90 because tan 90 is an asemtope -
kosy91
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- 21-01-2010 08:54
(Original post by crazygirl29)
wait a minute. it wont because if u put 45 or 135 back in the equation
cosec^2x- cot 2x u dont get one. its maths error!! so it dont work
i think it does work -
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- 21-01-2010 09:10
why is everyone so quite???
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Superman_Jr
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- 21-01-2010 09:13
That was ****. Everyone in my class found it hard but all you guys found it so easy. Can't believe I got R = 6 for one of the questions....epic fail.
I think my lowest is going to be 65/75. 1 word...............RETAKE!
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