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If [Cot^(-1)x]+[Cos^(-1)x]=0 where x is ...

If `[Cot^(-1)x]+[Cos^(-1)x]=0` where x is non-negative real number and `[*]` denotes the greatest integer function, then complete set of values of x is

A

(cos1, 1]

B

(cos1, cot1]

C

(cot1, 1]

D

(0, cos1)

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The correct Answer is:
C
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