- $ f'\\\left( x \\\right) = \\\frac{{3\\\ln 2}}{{\\\left( {3x - 1} \\\right)}}$.
- $ f'\\\left( x \\\right) = \\\frac{3}{{\\\left( {3x - 1} \\\right)\\\ln 2}}$.
- $ f'\\\left( x \\\right) = \\\frac{1}{{\\\left( {3x - 1} \\\right)\\\ln 2}}$.
- $ f'\\\left( x \\\right) = \\\frac{3}{{\\\left( {3x - 1} \\\right)}}$.