25. define if xe ]0,2[ and x is rational j 2x-1 if xe l0,2[ and x is irrational which of the following statements are true? (a) fis not differentiable at x =1 (

25. Define if xe ]0,2[ and x is rational J 2x-1 if xe l0,2[ and x is irrational Which of the following statements are true? (a) fis not differentiable at x =1 (b) fis differentiable at x=1 (c) fis differentiable only at x=1