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Q.

The function f(x)=π4+tan-1x,|x|≤112(|x|-1),|x|>1 is:

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a

both continuous and differentiable on R – {- 1 }

b

both continuous and differentiable on R – {1}

c

continuous on R – {1} and differentiable on R- { - 1, 1 }.

d

continuous on R – { - 1} and differentiable on R – {-1, 1}.

answer is C.

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Detailed Solution

f(x)=π4+tan-1x|x|≤112(|x|-1)|x|>1  ⇒f(x)=12(x-1)                  x>1 π4+tan-1x           -1≤x≤112(-x-1)               x<-1       ⇒f'(x)=12             x>111+x2        -1
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