For $0 \leq x \leq 2\pi$, $\sin x$ and $\cos x$ are both decreasing functions in the interval __________.
- $\bigg( 0, \dfrac{\pi}{2} \bigg) \\$
- $\bigg( \dfrac{\pi}{2}, \pi \bigg) \\$
- $\bigg( \pi, \dfrac{3\pi}{2} \bigg) \\$
- $\bigg(\dfrac{3 \pi}{2}, 2 \pi \bigg)$