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Q.

f(x)=a+sinxx,     x>02                , x=0b+sinx-xx3, x<0where [.] denotes the greatest integer function. If f(x) is continuous at x= 0 then b=

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a

a-1

b

a+1

c

a+2

d

a-2

answer is B.

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Detailed Solution

fx=a+sin [x]x         ;x>02                          ;x=0b+sin x-xx3   ;x<0 RHL=limx0+fx=limx0+a+sin [x]x=a+0 LHL=limx0-fx=limx0-b+sin x-xx3 sin x=x-x33!+x55!---- =limx0-b+-13!+x25!--- =b-1 f is continuous limx0-fx=limx0+fx=f0 b-1=a=2 b=a+1

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