Maths paper 12 ???

[Hedwig]

it said so in the question.

 

[Hedwig]

when cos theta is reflex, the angle is in the fourth quadrant. thus, sin theta and tan theta are negative. i wish i had written that!

 

[thementor]

WHAAT?? Why will tan be negative!! We never took it like that

lol it said theta was positive and it was reflex which means it lied in the fourth quadrant.
Sin and tan are both negative in the fourth quadrant genius.

 

[Muhammad Asadullah]

Guys, is there an ecf in p1?

 

[thementor]

How do u know that :/

It was written in the question Genius.

 

[thementor]

Guys, is there an ecf in p1?

yes

 

[Princess Raven]

when cos theta is reflex, the angle is in the fourth quadrant. thus, sin theta and tan theta are negative. i wish i had written that!

We didn't even take what a reflux angle is... I presumed it was just a normal angle

 

[siraj acharya]

what was the answer for q.no 2 .I only did till 6c2 and calculated x^2 so got 15 .will I get marks for this and for q.no 5 I used negative value for tan and calcualted will I get marks ?

 

[siraj acharya]

do you remember solution for q.no 9 and 10 ?

 

[Princess Raven]

what was the answer for q.no 2 .I only did till 6c2 and calculated x^2 so got 15 .will I get marks for this and for q.no 5 I used negative value for tan and calcualted will I get marks ?

It was -145

 

[Hedwig]

lol it said theta was positive and it was reflex which means it lied in the fourth quadrant.
Sin and tan are both negative in the fourth quadrant genius.

can u guess how much marks the examiner might cut if i used acute angle instead of reflex?

 

[randomcod]

Guys about the theta question you are worrying about nothing! Does NOONE remember square roots can be either positive or negative? The answer is correct. I have checked the mark scheme today, and the answer is simply the sqrt which can obviously be positive or negative!

 

[randomcod]

We'd lose 1 mark tops! No need to worry

 

[Hedwig]

are you serious???????????/ oh my god! where did u find the mark scheme?

 

[Hedwig]

can anyone send me the link for the markscheme? how can it be released so fast!

 

[Jelleh Belleh]

Guys about the theta question you are worrying about nothing! Does NOONE remember square roots can be either positive or negative? The answer is correct. I have checked the mark scheme today, and the answer is simply the sqrt which can obviously be positive or negative!

What're you talking about??
Dude,
sqrt 9 = 3
- sqrt 9 = -3
Of course it's not the same! And what marking scheme did you check??

 

[Alex10]

https://www.xtremepapers.com/community/threads/pure-mathematics-may-2014-p12-solutions.33447/

 

[randomcod]

What're you talking about??
Dude,
sqrt 9 = 3
- sqrt 9 = -3
Of course it's not the same! And what marking scheme did you check??

No you don't understand what I mean. Up to the sqrt it's correct. Read my next post - we'd only lose 1 mark because of that.

 

[maestro maisam]

AS MATHS P1. MAY 2014. ANSWERS
1, (3.5, 0).

2, -145

3, (i) -root (1-k^2).
(ii) - root (1-k^2)/k
(iii) Theeta is reflex and lies in between 270-360.
Hence, 2 Theeta lies in between 540-720, which is 7th and 8th quadrant (3rd and 4th corresponding).
Since sin is always negative in 3rd and 4th quadrant, the value of sin 2 Theeta will be negative for 0<k<1.

4, (i) p = 2
(ii) Perimeter = 34.1 cm

5, (ii) 116.6 deg. and 296.6 deg.

6, (i) r = 1.5
(ii) For G.P, T4 = 27.
For A.P, T4 = 9.5

7, (ii) 12i + 9j - 2k (in cartesian form).

8, Maximum point is (-2, 10 5/6) or (-2, 10.83).

9, (ii) y = x/2 + 11/2
(iii) Area = 7/12 or 0.583 units^2.

10, (i) x = 5
(ii) g(x) >= -4
(iii) x < -6 or x >2
(iv) p = -4
(v) -2
(vi) h(x) = root(x + 4) - 2, for x >= -4.

 

[siraj acharya]

can you guve marks for eah question ?