Question

4. Given 15 cot A = 8, find sin A and sec A.
6. If Z A and B are acute angles such that cos A:
12
13
Q
calculate all other trigonometric ratios.
5. Given sec 0 =
7
1. If cot = - evaluate : (i)
8
(1 + sin 0) (1 - sin o)
(1 + cos 0) (1 - cos )
(ii) cot?
1 - tan? A
1 + tan2 A
= cos2 A-sinA or not.
8. If 3 cot A = 4, check whether
1
find the value of:
9. In triangle ABC, right-angled at B, if tan A =
v3
(i) sin A cos C + cos A sin C
cos A cos C - sin A sin C​

Answer 1

Answer:

(4.) given: 15 cot A=8

therefore cot A=8/15 = Base/Perpendicular

To Find: sin A and sec A

solution: (H)^= (P)^+ (B)^

(H)^= 8^+ 15^

(H)^= 64 + 225

(H)^ = 289

H= √289

H = 17

• sin A = P/H = 15/17

• secA = H/B = 17/8

complete!!