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Q.

 fx=atan-1 1x-4 if 0x<4btan-1 2x-4if 4<x<6sin-1 7-x+aπ4 if 6x8

and ⨍ 4=π2  is continuous on 0, 8 then a, b=

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a

1, 1

b

1, -1

c

-1, 1

d

-1, -1

answer is C.

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Detailed Solution

fx=atan-1 1x-4 if 0x<4btan-1 2x-4if 4<x<6sin-1 7-x+aπ4 if 6x8

f4=π2 is continuous on [0,8]

limx4-fx=f(4)limx4-atan-1 1x-4=π2

 -2=π2a=-1

limx6-fx=limx6+f(x)

limx6-btan-12x-4=limx6+sin-1 7-x+aπ4

btan-11=sin-11 -π4

bπ4=π2-π4b=1

a,b=(-1, 1)

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