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

Solving,

$\Rightarrow \text{2 sin A cos A} = \text{2 sin 30° cos 30°} \\[1em] = 2 \times \dfrac{1}{2} \times \dfrac{\sqrt{3}}{2} \\[1em] = \dfrac{\sqrt{3}}{{2}}.$

Hence, Option 2 is the correct option.