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If f(x)=int(x)^(x+1) e^(-t^(2)) dt, then...

If `f(x)=int_(x)^(x+1) e^(-t^(2)) dt`, then the interval in which `f(x)` is decreasing is

A

`(-1/2, oo)`

B

`(-oo, 2)`

C

`(-oo, 0)`

D

`(-2, 2)`

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A
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