The roots of the equation cot x-cosx=1-c...

The roots of the equation `cot x-cosx=1-cot xcos x` are (1) `npi+pi/4,n in I` (2) `2npi+pi/4,n in I` (3) `2npi+-pi` or `npi+pi/4,n in I` (4) `2npi+pi` or `(4n+1)pi/4,n in I` (5) `npi,n in I`

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