defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Trigonometry Properties of Triangles
In a ΔABC, (a + b + c) \(\left( \tan \frac{A}{2} + \tan \frac{B}{2} \right)\)is equal to
1
2a cot \(\frac{A}{2}\)
2
2b cot \(\frac{B}{2}\)
3
2c cot \(\frac{C}{2}\)
4
None of these