1. 4 sin A/2sin B/2 sin C/2
2. 4cos A/2 cos B/2 cos C/2
3. 8 sin A/2 sin B/2 sin C/2
4. 1+ 4sin A/2 sin B/2 sin C/2
8 sin A/2 sin B/2 sin C/2
1. 1+4sin A/2sin B/2 sin C/2
2. 1+4 cos A/2cos B/2sin C/2
3. 1+ 4 cos A/2 cos B/2 cos C/2
4. 1+ 4cos A/2sin B/2 cos C/2
1+4sin A/2sin B/2 sin C/2
1. 9
2. 7
3. 3
4. 1
1
1. -1+4sin A/2sin B/2 sin C/2
2. -1+4 cos A/2cos B/2sin C/2
3. -1+ 4 cos A/2 cos B/2 cos C/2
4. -1+ 4cos A/2sin B/2 cos C/2
-1+ 4cos A/2sin B/2 cos C/2
1. 4 cos A/2 cos B/2 cos C/2
2. 4 sin A/2 sin B/2 sin C/2
3. 8 cos A/2 cos B/2 cos C/2
4. 1+ 4 sin A/2 sin B/2 sin C/2
8 cos A/2 cos B/2 cos C/2
1. Only I is true
2. Only II is true
3. both I and II are true
4. Neither I nor II are true
Only I is true
1. 1-2 cos A cos B cos C
2. 1+2 cos A cos B cos C
3. 1+cos A cos B cos C
4. 1-cos A cos B cos C
1-2 cos A cos B cos C
1. Only I is true
2. Only II is true
3. both I and II are true
4. Neither I nor II are true
Only II is true
1. 1- 2 sin A sin B cos C
2. 1- 2 sin A cos B sin C
3. 1- 2 cos A cos B cos C
4. 1- 2 sin A sin B sin C
1- 2 sin A sin B cos C
1. 1- 2 sin A/2 sin B/2 sin C/2
2. 1- 2 cos A/2 cos B/2 cos C/2
3. 1- 2 cos A/2cos B/2 sin C/2
4. 1- 2 sin A/2cos B/2 sin C/2
1- 2 cos A/2 cos B/2 cos C/2