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Q.

Let f:RR be defined by f(x)=α+sin[x]x,ifx>02,ifx=0β+sinxxx3,ifx<0 where [x] denotes the integral part of x. If f  continuous at x = 0, then β-α=

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a

-1

b

1

c

0

d

2

answer is B.

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Detailed Solution

LHLlimx0  β+sinx-xx3use l hospital rule =β+limx0 cosx-13x2=β+limx0  -sinx6x=β-1

RHL=α+0x=α

α+0=2=β1α=β1βα=1

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