# Edexcel FP3 June 2015 - Official ThreadWatch

3 years ago
#141
(Original post by TeeEm)
YOU NEED TO SPEAK TO A PURIST ... Sorry I do Physically applied/methods
I remember back to my degree says, that if a matrix is symmetric then the eigenvectors have to be orthogonal, but I do remember the proof ...
My apologies.
no worries. Thankyou for replying. I tried reading the theory behind the matrix stuff and gained some understanding behind determinants and why the characteristic formula for eigenvalues holds. But when i tried to understand the reason behind the eigenvectors being orthogonal for a symmetric matrix, i could not gain the intutive feeling.
I have downloaded few linear algebra textbooks and will be reading those during holidays to get better understanding.
I don't understand the thought in introducing all this matrix stuff in fp3 without first explaining linear algebra.
0
3 years ago
#142
In the following links there are resources for the FP3 EDEXCEL

HYPERBOLIC FUNCTIONS

MATRICES

VECTORS

INTEGRATION

ARCLENTH & SURFACE

CONICS

REDUCTION FORMULAS

anything missing?
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3 years ago
#143
Differentiation, but that is easy in FP3 anyway.

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0
3 years ago
#144
some basic differentiation here in the attached PDF (answer in the pink section)

hyperbolic differentiation in
HYPERBOLIC FUNCTIONS

inverse trig differentiation at the end of the booklet in this link
INVERSE TRIGONOMETRIC FUNCTIONS
1
3 years ago
#145
if the cross product of two vectors gives a vectors (axb) that is perpendicular to both a and b, is the the exception to this when a and b are parallel? if, lets say, you did want to find a vector perpendicular to a and b where a and b are parallel how would you go about this then?
1
3 years ago
#146
in June 2009 question 1, for sechx=3/5 don't you get an answer of In(3) when you use the indentity? (using x as 5/3?)
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3 years ago
#147
(Original post by mmms95)
in June 2008 question 1, for sechx=3/5 don't you get an answer of In(3) when you use the indentity? (using x as 5/3?)
Can you link the paper? Can't find it
0
3 years ago
#148
When Edexcel sort out your modules to determine whether they go in maths or further maths, do they sort them to give you the best possible grade in both subjects, or do they put the best modules in maths? Also, do you have any say onhow you want the modules arranged ?

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0
3 years ago
#149
(Original post by BP_Tranquility)
When Edexcel sort out your modules to determine whether they go in maths or further maths, do they sort them to give you the best possible grade in both subjects, or do they put the best modules in maths? Also, do you have any say onhow you want the modules arranged ?

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But if you aren't happy with the way they arrange it, I think you can get it changed. (I was worried about this too and this is what my teacher told me)
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3 years ago
#150
(Original post by BP_Tranquility)
When Edexcel sort out your modules to determine whether they go in maths or further maths, do they sort them to give you the best possible grade in both subjects, or do they put the best modules in maths? Also, do you have any say onhow you want the modules arranged ?

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Best grade in maths then best grade FM the max UMS in maths the max UMS in FM

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3 years ago
#151
(Original post by Navo D.)
Can you link the paper? Can't find it
sorry i meant june 2009 https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

also on question 5 i don't understand how they simplified the integral in the markscheme (https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf)

how did they deal with the (25-x^2) on top?
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3 years ago
#152
(Original post by rachu)
I have downloaded few linear algebra textbooks and will be reading those during holidays to get better understanding.
I don't understand the thought in introducing all this matrix stuff in fp3 without first explaining linear algebra.
Linear algebra is just matrices tbh.
0
3 years ago
#153
(Original post by mmms95)
if the cross product of two vectors gives a vectors (axb) that is perpendicular to both a and b, is the the exception to this when a and b are parallel? if, lets say, you did want to find a vector perpendicular to a and b where a and b are parallel how would you go about this then?
You only need to find a vector, say v=(xi+yj+zk) that is perpendicular to a. So v•a=0

Choose values for x and y, as there are infinitely many values, then choose a z value which is consistent with this information
1
3 years ago
#154
(Original post by mmms95)
in June 2009 question 1, for sechx=3/5 don't you get an answer of In(3) when you use the indentity? (using x as 5/3?)
What identity? I'm pretty sure you just have to rewrite in terms of e and solve the resulting quadratic
0
3 years ago
#155
(Original post by Navo D.)
What identity? I'm pretty sure you just have to rewrite in terms of e and solve the resulting quadratic
in the alternative method (ii) https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

i got sechx=3/5 and i used arcoshx =In(x+sqrt(x^2 -1) and when i substitued 5/3 i get In 3 which is not the answer
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3 years ago
#156
Do we need to know how to work with ellipses or hyperbolae with focii on the y axis?

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3 years ago
#157
(Original post by rayquaza17)
But if you aren't happy with the way they arrange it, I think you can get it changed. (I was worried about this too and this is what my teacher told me)
(Original post by physicsmaths)
Best grade in maths then best grade FM the max UMS in maths the max UMS in FM

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Oh, okay, thanks

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3 years ago
#158
(Original post by mmms95)
in the alternative method (ii) https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

i got sechx=3/5 and i used arcoshx =In(x+sqrt(x^2 -1) and when i substitued 5/3 i get In 3 which is not the answer
Remember, arcosh(x) also equals ln(x-sqrt(x^2 -1)
0
3 years ago
#159
(Original post by Gome44)
Remember, arcosh(x) also equals ln(x-sqrt(x^2 -1)
ooohh, ok thanks!
0
3 years ago
#160
(Original post by rayquaza17)
Linear algebra is just matrices tbh.
yes but in a proper textbook focusing on it, they explain the proof and the theory behind the mechanistic steps that we follow in fp3 matrices chapter
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