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Let, a in RR and let f:RR to RR be given...

Let, `a in RR` and let `f:RR to RR` be given by `f(x)=x^(5)-5x-a`. Then

A

f(x) has three real roots if `a gt 4`

B

f(x) has only one real root if `a gt 4`

C

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

D

f(x) has three real roots if `-4lt a lt4`

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