how on earth did you do the last question? I didnt even understand what i wa being asked to find?

Thanks for the irrational eigenvectors too,

area of oqr = xy?

bye bye a*

(edited 8 years ago)

Reply 689

Ilovemaths96

Original post by cogito.

70 for 100UMS ?

Posted from TSR Mobile

has it even been that low?

Reply 690

Ilovemaths96

Original post by elliemoriarty

Method for part c of the last question?

scribble soemthing down and hope thats right! i could not do it!

Reply 691

username1432489

Original post by elliemoriarty

Method for part c of the last question?

Same as last years basically

You have the general point, P(2cos(x), sin(x))

Then let 2 points with x=alpha, x=beta or something

Find the gradient, let it equal =m (constant)

Find the midpoint of the 2 points

Then rearrange to eliminate the variables and you should have got

Y=(-1/4m)X

Reply 692

username1432489

Original post by Ilovemaths96

how on earth did you do the last question? I didnt even understand what i wa being asked to find?

Thanks for the irrational eigenvectors too,

area of oqr = xy?

bye bye a*

I got OQR=1

Had like Q(e^t, e^t) and R(e^-t, -e^-t) and find OQ and OR by Pythagoras and then area = 1 therefore independent of variable 't'

Reply 693

cogito.

Ok, i feel fked,
Q1- hyperbolic - easy 1/4ln5/3
Q2 - hyperbolic in exponential - normal
Q3 - eigenvector - normal 2,2+-sqrt(2)
Q4 - integration for (x+1)^2-4 - easy
Q5 - conics? hyperbola - c) is hard
Q6 - vectors - slightly easy than before
Q7 - reduction? strange - normal/hard 8/105
Q8 - conics - hard

Comparing to the hardest paper in history i.e. 2009 or 2014
for 2009 as comparison to 2015
Q1. identical - easier
Q2. vector - easier
Q3. eigenvector - same/easier (they have integer eigenvalues)
Q4.differentiation - normal and little bit hard
Q5. reduction - harder but regular rather than 2015's form
Q6. hyperbola - easier than Q8 in 2015
Q7. vector - slightly harder
Q8. integration - same

and for 2009 is 50 for 80UMS, so 2015 will be -2/3 maximum

Predicted UMS as Minimum (don't think will go lower)

65 - 100UMS
59 - 90UMS
52 - 80UMS

(edited 8 years ago)

Reply 694

nanairo

Original post by Ilovemaths96

how on earth did you do the last question? I didnt even understand what i wa being asked to find?

Thanks for the irrational eigenvectors too,

area of oqr = xy?

bye bye a*

at least you can get an A, I maybe get b or c in fp3😭