If sin A = cos A, the measurement of angle A is :

1. 0°

2. 30°

3. 45°

4. 60°

If sin A = cos B and A ≠ B then the relation between angles A and B is :

1. A + B = 180°

2. A - B = 90°

3. B - A = 90°

4. A + B = 90°

The value of :

cosec 40° cos 50° + sin 50° sec 40° is:

1. 1

2. 2

3. 3

4. 0