Q60 / 125 · BITSAT 2017 · Mathematics

If fx=ex,x≤01-x,x>0, then

  • A
    fx is differentiable at x=0
  • Correct answer
    B
    fx is continuous at x=0,1
  • C
    fx is differentiable at x=1
  • D
    None of the above

Solution

fx=ex,x≤01-x,0<x≤1x-1,x>1

Figure

RHD: f'0=limh→0f0+h-f0h=limh→0-h-1h=-1

LHD: f'0=limh→0f0-h-f0-h=limh→0e-h-1-h=1

So, it is not differentiable at x=0.

Similarly, it is not differentiable at x=1 but it is continuous at x=0 and 1.

Hence, the correct answer is option: 'B'.

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