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

જો \(f(x)=\left\{\begin{array}{cc}\frac{a|x|+x^2-2(\sin |x|)(\cos |x|)}{x} & , x \neq 0 \\ b & , x=0\end{array}\right.\) એ x = 0 પર સતત હોય, તો a + b = ___ .

  1. A 1
  2. B 2
  3. C 0
  4. D 4
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Answer & Solution

Correct Answer

(B) 2

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Detailed explanation

\(f(x)=\left\{\begin{array}{cc}\frac{a|x|+x^2-2 \sin |x| \cos |x|}{x} & ; x \neq 0 \\ b & ; x=0\end{array}\right.\) for continuity \(\lim _{x \rightarrow 0^{-}} f(x)=\lim _{x \rightarrow 0^{+}} f(x)=f(0)\) \(\lim _{x \rightarrow 0^{-}} \frac{ ah + h ^2-2(\sinh ) \cosh }{- h }\)…
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