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What is the condition for a function f to be constant if f be continuous and differentiable on (a,b)?(a) f’(x) > 0 ∀ x1, x2 ∈ (a,b)(b) f’(x) < 0 ∀ x1, x2 ∈ (a,b)(c) f’(x) = 0 ∀ x1, x2 ∈ (a,b)(d) f’(x) ≤ 0 ∀ x1, x2 ∈ (a,b)I had been asked this question in examination.This intriguing question originated from Derivatives Application topic in division Application of Derivatives of Mathematics – Class 12

Answer»

Correct choice is (c) f’(X) = 0 ∀ x1, x2 ∈ (a,b)

For explanation I would say: One of the properties of a function is to be constant. A function is said to be constant when it satisfies the condition f’(x) = 0 ∀ x1, x2 ∈ (a,b) where the function ‘f’ should be CONTINUOUS and DIFFERENTIABLE on (a,b).



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