Question

If function' $f$ ' is differentiable in an interval $I$, then it means

• A. its derivative $f$ ' does not exist at each point of $I$
• B. its derivative $f$ ' exists at each point of $I$
• C. its derivative may or may not exist at each point of $I$
• D. Data inadequate

Answer 1

Answer: (B)

(b) If a function $f$ is differentiable in an interval $I$ i.e., its derivative $f$ ' exists at each point of $I$.