Trigonometryhard · Past Paper
In ABC, cot A/2 + cot B/2 + cot C/2 = ?
Acot A/2 cot B/2 cot C/2
B1
C0
Dtan A/2 tan B/2 tan C/2
✓ Correct Answer: A — cot A/2 cot B/2 cot C/2
This is a conditional identity for half-angles of a triangle.
Share this question
More from Trigonometry
- Find the value of (1 + tan θ + sec θ)(1 + cot θ - cosec θ).
- The angle of elevation of the top of a building from the foot of a tower is 30° and from the foot of the building to the top of the tower is 60°. If the tower is 50 m high, find building height.
- Using compound angle formulas, sin(A + B) is equal to:
- What is the value of 1 + tan² A?
- If cosec θ - cot θ = p, find the value of cos θ.