Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Let ƒ(x) = sgn (sgn (sgn x)). Then 
ƒ(x) is -
Text Solution
Verified by ExpertsThe correct answer is:
D
By definition we have for x ≠ 0, sgn (sgn x)
= sgn 
= 
= 
= sgn x. Thus, sgn [sgn)
(sgn x) = sgn x = 
Therefore, 
ƒ(x) = 1 but 
ƒ(x) = –1.
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