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

1. -1

2. 0

3. 1

4. 2

Solving,

$\text{(sin 30° + cos 30°) - (sin 60° + cos 60°)} = \Big(\dfrac{1}{2} + \dfrac{\sqrt{3}}{{2}}\Big) - \Big(\dfrac{\sqrt{3}}{2} + \dfrac{1}{2}\Big) \\[1em] = \dfrac{1}{2} + \dfrac{\sqrt{3}}{2} - \dfrac{\sqrt{3}}{2} - \dfrac{1}{2} \\[1em] = 0.$

Hence, Option 2 is the correct option.