The function f(x) = begin{cases} frac{pi}{4} | vedclass

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(A) The function is defined as:$f(x) = \begin{cases} \frac{\pi}{4} + 	an^{-1} x, & x \in [-1, 1] \ \frac{1}{2}(-x-1), & x < -1 \ \frac{1}{2}(x-1),

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continuous on $R - \{1\}$ and differentiable on $R - \{-1, 1\}$

Vedclass · Answer

(A) The function is defined as:$f(x) = \begin{cases} \frac{\pi}{4} + 	an^{-1} x, & x \in [-1, 1] \ \frac{1}{2}(-x-1), & x  1 \end{cases}$Check continuity at $x = -1$:$LHL = \lim_{x 	o -1^-} \frac{1}{2}(-x-1) = 0$$RHL = \lim_{x 	o -1^+} (\frac{\pi}{4} + 	an^{-1} x) = \frac{\pi}{4} - \frac{\pi}{4} = 0$Since $LHL = RHL = f(-1)$,the function is continuous at $x = -1$.Check continuity at $x = 1$:$LHL = \lim_{x 	o 1^-} (\frac{\pi}{4} + 	an^{-1} x) = \frac{\pi}{4} + \frac{\pi}{4} = \frac{\pi}{2}$$RHL = \lim_{x 	o 1^+} \frac{1}{2}(x-1) = 0$Since $LHL 
eq RHL$,the function is discontinuous at $x = 1$.Check differentiability at $x = -1$:$LHD = \frac{d}{dx} [\frac{1}{2}(-x-1)] = -\frac{1}{2}$$RHD = \frac{d}{dx} [\frac{\pi}{4} + 	an^{-1} x] = \frac{1}{1+x^2} = \frac{1}{1+(-1)^2} = \frac{1}{2}$Since $LHD 
eq RHD$,the function is non-differentiable at $x = -1$.Thus,the function is continuous on $R - \{1\}$ and differentiable on $R - \{-1, 1\}$.

Column $I$	Column $II$
$A$. $x\|x\|$	$I$. Strictly increasing and continuous in $(-1,1)$
$B$. $\sqrt{\|x\|}$	$II$. Continuous but not differentiable in $(-1,1)$
$C$. $x+[x]$	$III$. Differentiable in $(-1,1)$
$D$. $\|x-1\|+\|x+1\|+\|x\|$	$IV$. Differentiable in $(-1,0) \cup (0,1)$
	$V$. Strictly increasing and not differentiable in $(-1,1)$

The function $f(x) = \begin{cases} \frac{\pi}{4} + \tan^{-1} x, & |x| \leq 1 \\ \frac{1}{2}(|x|-1), & |x| > 1 \end{cases}$ is:

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