Exam 1 Answers

[hifer]

My answers:
1) [x^2(3sinx - xcosx)] / (sinx)^2
2a) (e^2 - 10)/6
b) 2
3a) Derivative graph
3b) R\ {0, 3} or (-oo, 0) U (0,3) U (3, oo)
4) 2/3
5) 5/16
6a) 5/24
b) 1/3
7) (1/9)sin3x - (1/3)xcos3x
8a) x = 2, 5/2
b) 7/4
9a) y=-2x+2
b) 2(e^(1/2) - 1)
10) I got this wrong, ans is k= 2/3  Anyone rmb how many marks this was worth?
11a) 0.68
11b) 8/17
12) P(4,2) OP = 2sqrt(5)

[kido_1]

Pretty much similar answers, except for the prob questions.

[JohnS]

For 10, k=3/2, not 2/3

[hifer]

For 10, k=3/2, not 2/3

yup my mistake again ><

[hifer]

Pretty much similar answers, except for the prob questions.

Wat did u get for the prob ques? i'm pretty sure i got them right..

[JohnS]

I got everything except for the conditional prob plane question. I wrote 10/17 instead of 8/17. Do you think ill get one mark?

[Daniel15]

This is looking really good for me... Maybe I will get a 40 in Methods after all

12) 2sqrt(5)

You need the co-ordinates and the length for that question. The co-ordinates were (2, 4) (I think, that's from memory).

3b) R\ {0} U {3}

I wrote that as R\{0, 3}... Is that notation also correct?

[Matt89]

12) 2sqrt(5)

And P = (4,2)

I think i did alright. Dropped one mark definitely. Anything more than 4 marks dropped would be a huge surprise to me

[hifer]

12) 2sqrt(5)

And P = (4,2)

I think i did alright. Dropped one mark definitely. Anything more than 4 marks dropped would be a huge surprise to me

Yup, lol

[hifer]

This is looking really good for me... Maybe I will get a 40 in Methods after all

12) 2sqrt(5)

You need the co-ordinates and the length for that question. The co-ordinates were (2, 4) (I think, that's from memory).

3b) R\ {0} U {3}

I wrote that as R\{0, 3}... Is that notation also correct?

11a) 0.68
11b) 8/17

OMG, I guessed them and got the same answers! So am I right?  :lol:  :lol:

Ya, i think R\{0, 3} is actually a better way to write it.. lol i actually wrote down the 3 separate domains..

[Matt89]

2a) (e^2 - 10)/6
b) 2

Could someone please tell me what questin 2b) was. I remember getting (a) the same as above, but i'm not too sure about (b)

[blue23]

would you lose marks if you left it as squareroot(20) instead of 2squareroot(5)?

[bilgia]

2b) was g(x) = loge(tanx) and evaluate g'(pi/4)

[hifer]

would you lose marks if you left it as squareroot(20) instead of 2squareroot(5)?

I'm also interested in knowing this, I got the wrong value for K coz i didn't simplify properly... ><

[mtyp]

omg how much is question 11(b) worth? i put 0.4/0.68 = 4/68 = 1/17 -.-