Edexcel A2 C4 Mathematics June 2016 - Official Thread

How many marks is the last question (coordinates of E)?

60e^-2/5t

How was the area 12/5. I got 4

I got 512pi-(10245)pi as well...

Fairly certain this is correct as it simplifies to 1696/5 pi

512-(1024/5) doesn't take in to account the volume between 0 and 1/2

It was 544-(1024/5) or what you said plus 32

For Q7 working out the volume, i rearranged it to make x the subject and then i worked out the volume in terms of y although i think i got the answer wrong, would i get marks for this?

i've made a ton of careless mistakes

My full solutions:

1) 1/8 - 15/16 x + 75/16 x^2 - 625/32 x^3

2) 0.6595, 1.083, 8/3 ln(2) - 7/9

3) (-2-4xy)/(2x^2 + 4 + pisin(0.5pi)), (3pi+62)/(pi+22)

4) x=e^(ln(60)-2.5t)), 633 mins

5) (-5root(3)/16), (4,5root3)

6) 3ln(3y+2)-2ln(y)+c, lambda=8, 4pi/3 - root3

7) k=17/2, 1696pi/5

8) {3,5,0}, r = {1,5,2} + lambda{-5,4,3}, k=2, cos(theta)=4/5, area=12/5, possible positions {3, 33/5, 16/5} and {-1, 17/5, 4/5}

512-(1024/5) doesn't take in to account the volume between 0 and 1/2

It was 544-(1024/5) or what you said plus 32

got everything the same