(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

If θ is an acute angle of a right triangle, then the value of

sin θ cos(90° - θ) + cos θ sin (90° - θ) is

1. 0

2. 2 sin θ cos θ

3. 1

4. 2 sin² θ