Published by:
CGP EDU Academic Team
Published on: August 12, 2026
f(x) = 
, then
A
f ' (x) = 0 
x = 
, n ∈ Z
x = , n ∈ Z
B
f ' (x) = 0 
x = (2n + 1) 
, n ∈ Z
x = (2n + 1) , n ∈ Z
C
f ' (x) = 0 
x = n π , n ∈ Z
x = n π , n ∈ Z
D
f ' (x) ≠ 0 
x ∈ R
x ∈ R
Text Solution
Verified by ExpertsThe correct answer is:
B
f ' (x) = cosx 
Note that f ' (x) = 0 ∀ x ∈ (2n + 1) 
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