If A = 30°, then the value of 2 sin A cos A is

1. $\dfrac{1}{\sqrt{2}}$

2. $\dfrac{\sqrt{3}}{2}$

3. $\dfrac{1}{2}$

4. 1

The value of (sin 30° + cos 30°) - (sin 60° + cos 60°) is

1. -1

2. 0

3. 1

4. 2

The value of $\dfrac{1}{\text{sin 30°}} - \dfrac{\sqrt{3}}{\text{cos 30°}}$ is

1. 2

2. 1

3. $\dfrac{1}{2}$

4. 0

If tan A = $\sqrt{3}$, then the value of cosec A is

1. $\dfrac{1}{2}$

2. 2

3. $\dfrac{2}{\sqrt{3}}$

4. $\dfrac{\sqrt{3}}{2}$