6. 6
N0. SOLUTION MARKS
6
(a)
9 10 010 10
9 9
0 85 0 15
8
9 10
0 85 0 15 0 85 0 15
0 5443
p q
P X
P X P X
C C
(b)
7 96 8.03
7 96 8 8 03 8
0 1 0 1
0 4 0 3
1 0 4 0 3
0 2733
P X
z
P z
P z P z
P1
K1 use n r n r
rC p q
N1
K1 Use score-z
Z =
X
K1
N1
6
7. 7
N0. SOLUTION MARKS
7
(a)
2
2
2
sin cot sin
sin cot 1
sin cos
cos
x x x
x x
x ec x
ec x
(b)
(i)
3
2 cos
2
y x
(ii)
(iii)
5
0
2
3
2
x
f x
x
y
Number of solutions = 2
K1
N1
P1 graph cosine curve
P1 amplitude 2
P1 cycle
3
2
cycle 0 to 2
P1 f x
P1 shifted graph
3
1 2 cos
2
x
K1
3
2
x
y
N1 equation
3
2
x
y
N1
10
8. 8
N0. SOLUTION MARKS
8
(a)
(b)
(c)
5
sin
10
0.5236
AOD
AOD rad
10 0.5236
5.236
ADS
1
10
5
2
DC
5.236 2 5 8
20.24
Perimeter
21 1
(8 12)5 (10) (0.5236)
2 2
23.82
Luas
K1
N1 in rad
K1 Use s r
K1
K1
N1
K1 K1 K1 Use formula
21
2
A r
N1
10
15. 15
N0. SOLUTION MARKS
15
(a)
(b)
(c)
(i)
(ii)
50
1
2
20 15 1500
4 3 300
x y
y x
x y
x y
At least one straight line is drawn correctly from
inequalities involving x and y.
All the three straight lines are drawn correctly
Region is correctly shaded
20
max
cos 20(20) 15(30)
850
1500 850
RM650
t
P
N1
N1
N1
N1
N1
N1
N1
K1
K1
N1
10
END OF MARKING SCHEME
R
50 750
50
x + y = 50
4x + 3y = 300
x = 2y
x
y
100