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

माना \(f: R \rightarrow R\) है, जो  \(f(x)=\left\{\begin{array}{cc}2 \sin \left(-\frac{\pi x}{2}\right), & \text { if } x<-1 \\ \left|a x^{2}+x+b\right|, & \text { if }-1 \leq x \leq 1 \\ \sin (\pi x), & \text { if } x>1\end{array}\right.\) द्वारा परिभाषित है। यदि \(f( x ), R\) पर सतत् है, तो \(a + b\) का मान है

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

Answer & Solution

Correct Answer

(B) \(-1\)

Step-by-step Solution

Detailed explanation

\(f( x )\) is continuous on \(R\) \(\Rightarrow f\left(1^{-}\right)=f(1)=f\left(1^{+}\right)\) \(|a+1+b|=\lim _{x \rightarrow 1} \sin (\pi x)\) \(|a+1+b|=0 \Rightarrow a+b=-1 ....(1)\) \(\Rightarrow\) Also \(f\left(-1^{-}\right)=f(-1)=f\left(-1^{+}\right)\)…
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