Question
The range of the function $f(x) = \sin [x]$ for $x \leq -\frac{\pi}{4}$, where $[x]$ denotes the greatest integer \(≤\) $x$, is _______
The range of the function $f(x) = \sin [x]$ for $x \leq -\frac{\pi}{4}$, where $[x]$ denotes the greatest integer \(≤\) $x$, is _______