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

If sin α = $\dfrac{1}{2},$ then the value of 3 cos α - 4 cos³ α is

1. -1

2. 0

3. 1

4. 2

The value of $\dfrac{\text{1 - tan}^2 45°}{\text{1 + tan}^2 45°}$ is equal to

1. tan 60°

2. tan 30°

3. sin 45°

4. tan 0°