356 MATHEMATICS
5.
sin^5 ,,cos =^12 ,,tan^5 cot^12 cosec =^13
13 13 12 5 5✁ ✁ ✁
- (i)
49
64 (ii)49
64 8.Ye s- (i) 1 (ii) 0 10.
sinP =^12 ,,cosP =^5 tanP =^12
13 13 5 - (i) False (ii) True (iii) False (iv) False (v) False
EXERCISE 8.2
- (i) 1 (ii) 2 (iii)
32 6
8
✂
(iv)^43 24 3
11✄ (v)^67
12- (i) A (ii) D (iii) A (iv) C 3. ☎ A = 45°,☎ B = 15°
- (i) False (ii) True (iii) False (iv) False (v) True
EXERCISE 8.3
- (i) 1 (ii) 1 (iii) 0 (iv) 0
- ☎ A = 36° 5.☎ A = 22° 7. cos 23° + sin 15°
EXERCISE 8.4
1.
2
2
(^11) ,,1+ cot A
sin A = tan A = sec A =
1+cot A cot A cot A
2.
2
sinA = sec A – 1,,cosA =^1 tanA = sec A – 1^2
sec A sec A22
cot A = 1s,cosec A = ecA
sec A – 1 sec A – 1- (i) 1 (ii) 1 4.(i) B (ii) C (iii) D (iv) D
EXERCISE 9.1
- 10 m 2. 83m 3. 3m, 2 3m 4. 10 3 m