Maths

356 MATHEMATICS
5.
5
,
12
,
5
,
12
,
13
sin cos = tan cot cosec =
13 13 12 5 5
✁ ✁ ✁
7. (i)
49
64
(ii)
49
64
8. Yes
9. (i) 1 (ii) 0 10.
12
,
5
,
12
sinP = cosP = tanP =
13 13 5
11. (i) False (ii) True (iii) False (iv) False (v) False
1. (i) 1 (ii) 2 (iii)
EXERCISE 8.2
3 2 6 ✂
8
(iv)
43 24 3 ✄
11
2. (i) A (ii) D (iii) A (iv) C 3. ☎ A = 45°, ☎ B = 15°
4. (i) False (ii) True (iii) False (iv) False (v) True
EXERCISE 8.3
1. (i) 1 (ii) 1 (iii) 0 (iv) 0
3. ☎ A = 36° 5. ☎ A = 22° 7. cos 23° + sin 15°
EXERCISE 8.4
(v)
67
12
1.
1 1
sin A = , tan A = , secA =
2
1+cot A cot A
2
1+cot A
cot A
2.
2
sec A – 1
,
1
,
2
sinA = cosA = tanA = sec A –1
sec A
sec A
1
,
secA
cot A = cosec A =
2 2
sec A – 1 sec A – 1
3. (i) 1 (ii) 1 4. (i) B (ii) C (iii) D (iv) D
EXERCISE 9.1
1. 10 m 2. 8 3m 3. 3m, 2 3m 4. 10 3 m