(sec² θ - 1)(1 - cosec² θ) is equal to

1. -1

2. 1

3. 0

4. 2

(cos θ + sin θ)² + (cos θ - sin θ)² is equal to

1. -2

2. 0

3. 1

4. 2

(sec A + tan A)(1 - sin A) is equal to

1. sec A

2. sin A

3. cosec A

4. cos A