NDA 2024
- Exam
- NDA
- Year
- 2024
- Subject
- Mathematics
- Chapter
- Continuity and Differentiability
NDA 2024 · Mathematics · Continuity and Differentiability
Let f(x)=|x|+1 and g(x)=[x]-1 , where [.] is the greatest integer...
Let and , where [.] is the greatest integer function.
Let
Consider the following statements:
1. is differentiable for all g(x)x=0.0001g(x)x=2.5
Options
- A1 and 2 only
- B2 and 3 only
- C1 and 3 only
- D1,2 and 3
Correct answer
A. 1 and 2 only
Step-by-step solution
and
(1) For, is differentiable Statement (1) is correct.
(2) At is continuous everywhere except for integer value as [ ] is continuous g(x)x=0.0001\begin{aligned}
&\text{(3)} \quad g(x)=[x]-1 \\
& {[x] \Rightarrow \text{ Always } a b \text{ integer }} \\
& \qquad \begin{aligned}
g^{\prime}(x) & =\frac{d}{d x}[x]-0 \\
g^{\prime}(x) & =0-0=0
\end{aligned}\end{aligned}\Rightarrow Statement (3) is incorrect.
Hence, (1) and (2) only correct.