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JEE Mains · Maths · STD 12 - 5. continuity and differentiation

यदि \(f(x)=\left\{\begin{array}{ll}\frac{\sin (a+2) x+\sin x}{x} & ; x < 0 \\ b & ; x=0 \\ \frac{\left(x+3 x^{2}\right)^{\frac{1}{3}}-x^{-\frac{1}{3}}}{x^{\frac{4}{3}}} & ; x > 0\end{array}\right.\) \(x =0\) पर संतत है, तो \(a +2 b\) का मान है 

  1. A \(-1\)
  2. B \(1\)
  3. C \(-2\)
  4. D \(0\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(0\)

Step-by-step Solution

Detailed explanation

\(\lim _{x \rightarrow 0^{-}} f(x)=\lim _{x \rightarrow 0}\left(\frac{\sin (a+2) x}{x}+\frac{\sin x}{x}\right)=a+3\) \(\lim _{x \rightarrow 0^{-}} f(x)=\lim _{x \rightarrow 0} \frac{\left(x+3 x^{2}\right)^{1 / 3}-x^{1 / 3}}{x^{4 / 3}}\)…
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