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JEE Mains · Maths · STD 11 - 12. limits

माना \([ t ]\) महत्तम पूर्णांक \(\leq t\) को दर्शाता है तथा \(\lim _{ x \rightarrow 0} x \left[\frac{4}{ x }\right]= A\) है। तो फलन \(f(x)=\left[x^{2}\right] \sin (\pi x)\) असंतत् है, जब \(x\) बराबर है

  1. A \(\sqrt{A+5}\)
  2. B \(\sqrt{A+1}\)
  3. C \(\sqrt{A}\)
  4. D \(\sqrt{A+21}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\sqrt{A+1}\)

Step-by-step Solution

Detailed explanation

\(A=\lim _{x \rightarrow 0} x\left[\frac{4}{x}\right]=\lim _{x \rightarrow 0} x\left(\frac{4}{x}\right)-x\left\{\frac{4}{x}\right\}=4\) \(f(\mathrm{x})=\left[\mathrm{x}^{2}\right] \sin (\pi \mathrm{x})\) will be discontinuous at nonintegers…
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