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Let f(x) = x/(1 + x^2) and g(x) = e^(-x)...

Let `f(x) = x/(1 + x^2)` and `g(x) = e^(-x)/(1+[x]), `where [x] is the greatest integer less than or equal to x. Then

A

`dom (f + g) = R ~[2,0)`

B

`dom (f~g) = R ~ [-1, 0)`

C

range f `cap` range g = [-2, 1/2]

D

range of f `cap` range g = R

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B, D
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