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If [cot^(-1)x]+[cos^(-1)x]=0 , where [] ...

If `[cot^(-1)x]+[cos^(-1)x]=0` , where `[]` denotes the greatest integer functions, then the complete set of values of `x` is `(cos1,1)` (b) `cos1,cos1)` `(cot1,1)` (d) none of these

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