defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Trigonometry Multiple and Sub-multiple Angles
If cos θ = cos α cos β, then \(tan(\frac{θ + α}{2}) tan(\frac{θ - α}{2})\) is equal to
1
tan2\(\frac{α}{2}\)
2
tan2\(\frac{β}{2} \)
3
tan2\(\frac{θ}{2}\)
4
cot2\(\frac{β}{2}\)