Question
Write the range of the function $f(x)=\sin [x]$, where $\frac{-\pi}{4} \leq x \leq \frac{\pi}{4}$.

Answer

From the given question , we can write,
$\begin{array}{l}f(x)=\sin (x) \\ -\frac{\pi}{4} \leq x \leq \frac{\pi}{4} \\
\operatorname{Sin}\left[-\frac{\pi}{4}\right]=\sin (-1) \\ =-\sin 1 \\ \sin 0=0 \\ \sin
\frac{\pi}{4}=\sin 0 \\ =0\end{array}$
using properties of greatest integer function  
(1) = 1. (0.5) = 0. (0.5) = -1
Hence, R(f) = -( sin 1.0)

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