(b) $\lim_{x \rightarrow 0^{-}}{f(x)} = \lim_{x \rightarrow 0^{-}}\frac{\sin{(1 + \lbrack x\rbrack)}}{\lbrack x\rbrack}$ $= \frac{\sin{(1 - 1)}}{- 1} = 0$
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Ph.D. in Physics with 19+ years of teaching experience.