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Let a inRR and R and let f:RRrarrRR be g...

Let `a inRR` and R and let `f:RRrarrRR` be given by `f(x)=x^5-5x+a` Then

A

f(x) has three real roots if `agt4`

B

f(x) has one real roots if `agt4`

C

f(x) has three real roots if `alt-4`

D

f(x) has one real roots if `-4ltalt4`

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B, D
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