$\dfrac{\text{2 tan 30°}}{1 + \text{tan}^2 \text{ 30°}}$ is equal to :

1. sin 60°

2. cos 60°

3. sec 60°

4. cosec 60°

If tan 3A - ${\sqrt3}$ = 0 and 0 ≤ 3A ≤ 90° ; the measure of angle A is :

1. 15°

2. 20°

3. 30°

4. 10°

The value of :

cos² 60° - 2 sin³ 30° + 3 cot⁴ 45° is :

1. 1

2. -2

3. 3

4. 2

The value of $\dfrac{\text{cos 60° - cos 0°} + \text{2 sin 90°}}{\text{ cot 60°}\times \text{ cot 30°}}$ is :

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

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

3. -2

4. 1