First slide

Continuity

Question

$f (x) = S g n (x^{3} - x)$ is discontinuous at x =

Moderate

A

0
B

1
C

-1
D

0,-1,1

Solution

$f (x)$ is discontinuous when $x^{3} - x = 0 \Rightarrow x = 0, - 1, 1$

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