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Mathematics
Problem
For answers and explanations, turn to Chapter 19. 4.
lim
x
→
0
−
(
x
∣
x
∣
)
=
\lim _{x \rightarrow 0^{-}}\left(\frac{x}{|x|}\right)=
lim
x
→
0
−
(
∣
x
∣
x
)
=
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