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Let f(x)=(e^-x)/(1+[x]), then...

Let `f(x)=(e^-x)/(1+[x])`, then

A

Domain of definition of f(X) is R-[-1,0)

B

Range od definition of f(x) is (-1/e, 1]

C

f(x) is one-one in its domain

D

none of these

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A
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