The limit is
$$ \lim_{x\to0-} (1/x - 1/|x|) $$
I'm teaching myself basic calculus and I don't understand why the limit Does Not Exist. Can someone explain?
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Sign up to join this communityThe limit is
$$ \lim_{x\to0-} (1/x - 1/|x|) $$
I'm teaching myself basic calculus and I don't understand why the limit Does Not Exist. Can someone explain?
The notation $$x \to 0^-$$ indicates that the limit is taken as $x$ approaches $0$ from the left; i.e., $x < 0$. In such a case, recall that for real numbers $x$, the absolute value can be defined as $$|x| = \begin{cases} x, & x \ge 0 \\ -x, & x < 0. \end{cases}$$ Given this, what is $1/|x|$ when $x < 0$? What is $1/x - 1/|x|$ when $x < 0$? Now what is the limit as $x \to 0^-$?
Incidentally, what is the limit as $x \to 0^+$?