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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 f(x)=∣x∣+1f(x)=|x|+1 and g(x)=[x]−1g(x)=[x]-1, where [.] is the greatest integer function. Let h(x)=f(x)g(x)h(x)=\frac{f(x)}{g(x)} Consider the following statements: 1. f(x)f(x) is differentiable for all x<02.x < 0 2.g(x)iscontinuousatis continuous atx=0.00013.Thederivativeof3. The derivative ofg(x)atatx=2.5is1Whichofthestatementsgivenabovearecorrect?is 1 Which of the statements given above are correct?

Options

  1. A1 and 2 only
  2. B2 and 3 only
  3. C1 and 3 only
  4. D1,2 and 3

Correct answer

A. 1 and 2 only

Step-by-step solution

and f(x)=∣x∣+1g(x)=[x]−1h(x)=f(x)g(x)=∣x∣+1[x]−1\begin{aligned} f(x) & =|x|+1 \\ g(x) & =[x]-1 \\ h(x) & =\frac{f(x)}{g(x)}=\frac{|x|+1}{[x]-1}\end{aligned} (1) For, x<0x < 0f(x)=−x+1∴f(x)=−1\begin{aligned} & f(x)=-x+1 \\ & \therefore \quad f(x)=-1 \end{aligned}f(x)f(x) is differentiable ∀x<0⇒\forall x < 0\Rightarrow Statement (1) is correct. (2) At x=0.0001g(x)x=0.0001g(x) is continuous everywhere except for integer value as [ xx ] is continuous ∀x∈Rexceptintegers.So,\forall x \in \mathrm{R} except integers. So,g(x)iscontinuousatis continuous atx=0.0001.Statement(2)iscorrect.. Statement (2) is correct.\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.
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