- $ F\\\left( x \\\right) = 3{\\\rm{x}} - \\\tan x + C$
- $ F\\\left( x \\\right) = 3{\\\rm{x}} + \\\tan x + C$
- $ F\\\left( x \\\right) = 3{\\\rm{x}} + \\\cot x + C$
- $ F\\\left( x \\\right) = 3{\\\rm{x}} - \\\cot x + C$