JEE Main 202628 JanuaryEvening Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 28 January
- Shift
- Evening Shift
- Subject
- Mathematics
- Chapter
- Continuity and Differentiability
JEE Main 2026 · 28 January · Evening Shift · Mathematics · Continuity and Differentiability
Let f(x)= _ θ arrow 0 ( π x-x^ ((2)/(θ)) (x-1) 1+x^ ((2)/(θ)) (x-1)...
Let . Consider the following two statements :
(I) is discontinous at .
(II) is continous at .
Then,
(I) is discontinous at .
(II) is continous at .
Then,
Options
- AOnly (II) is True
- BNeither (I) nor (II) is True
- CBoth (I) and (II) are True
- DOnly (I) is True
Correct answer
B. Neither (I) nor (II) is True
Step-by-step solution
Taking the limit as , we note for and for . This gives:
\begin{cases} \cos \pi x & x \to 1^- \\ \dfrac{-\sin(x-1)}{(x-1)} & x \to 1^+ \end{cases}
Continuity at :
,
is continuous at . So Statement (I) is false.
Continuity at :
\begin{cases} \dfrac{-\sin(x-1)}{-(x-1)} & x \to -1^- \\ \cos \pi x & x \to -1^+ \end{cases}
Since LHL RHL, is discontinuous at . So Statement (II) is also false.
Hence, neither (I) nor (II) is true.
\begin{cases} \cos \pi x & x \to 1^- \\ \dfrac{-\sin(x-1)}{(x-1)} & x \to 1^+ \end{cases}
Continuity at :
,
is continuous at . So Statement (I) is false.
Continuity at :
\begin{cases} \dfrac{-\sin(x-1)}{-(x-1)} & x \to -1^- \\ \cos \pi x & x \to -1^+ \end{cases}
Since LHL RHL, is discontinuous at . So Statement (II) is also false.
Hence, neither (I) nor (II) is true.