Let g(x) = - f(-1) 2 x 2 (x – 1) – f (0) (x 2 – 1) + f(1) 2 x 2 (x + 1) – f ′ (0) x (x –…

Mathematics · JEE Main · NTA ExamsLimit, Continuity and Differentiability

Let g(x) = \(-\frac{f(-1)}{2}\) x2 (x – 1) – f (0) (x2 – 1)
\(+\frac{f(1)}{2}\) x2 (x + 1) – f ′ (0) x (x – 1) (x + 1) where f is a thrice differentiable function. Then the correct statements are
  1. there exists x (–1, 0) such that f (x) = g (x)
  2. there exists x (0, 1) such that f ′′ (x) = g′′ (x)
  3. there exists x (–1, 1) such that f ′′′ (x) = g′′′ (x)
  4. there exists x (–1, 1) such that f ′′′ (x) = 3f (1) – 3f (–1) – 6f (0)

Answer

(A) there exists x ∈ (–1, 0) such that f ′ (x) = g ′ (x), (B) there exists x ∈ (0, 1) such that f ′′ (x) = g ′′ (x), (C) there exists x ∈ (–1, 1) such that f ′′′ (x) = g ′′′ (x), (D) there exists x ∈ (–1, 1) such that f ′′′ (x) = 3 f (1) – 3 f (–1) – 6 f ′ (0)

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