Let f : [ a , b ] → [1, ∞) be a continuous function and let g : R → R be defined as g(x)=…

Mathematics · JEE Advanced · NTA ExamsLimit, Continuity and Differentiability

Let f : [a, b] → [1, ∞) be a continuous function and let
g : R R be defined as \[g(x)=\left\{\begin{array}{llc} 0 & \text { if } & xb \end{array}\right.\]
Then
  1. g(x) is continuous but not differentiable at a
  2. g(x) is differentiable on R
  3. g(x) is continuous but not differentiable at b
  4. g(x) is continuous and differentiable at either a or b but not both

Answer

(B) g ( x ) is differentiable on R

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