Half-AngleMediumQuestion 200015
Question
tan(θ/2) in terms of sin θ and cos θ is:
- Asin θ/(1 + cos θ)
- B(1 − cos θ)/sin θ
- CBoth A and BCorrect
- Dcos θ/(1 + sin θ)
Correct answer
Both A and B
Explanation
Both forms are valid: tan(θ/2) = sin θ/(1 + cos θ) = (1 − cos θ)/sin θ. Verify by cross-multiplying.