If \({\rm{\alpha }} = {\rm{co}}{{\rm{s}}^{ - 1}}\left( {\frac{3}{5}} \right),{\rm{\beta }} = {\rm{ta}}{{\rm{n}}^{ - 1}}\left( {\frac{1}{3}} \right)\), where \(0 < {\rm{\alpha }},{\rm{\beta }} < \frac{{\rm{\pi }}}{2},\) then α – β is equal to:

• A. \({\rm{ta}}{{\rm{n}}^{ - 1}}\left( {\frac{9}{{5\sqrt {10} }}} \right)\)
• B. \({\rm{co}}{{\rm{s}}^{ - 1}}\left( {\frac{9}{{5\sqrt {10} }}} \right)\)
• C. \({\rm{ta}}{{\rm{n}}^{ - 1}}\left( {\frac{9}{{14}}} \right)\)
• D. \({\rm{si}}{{\rm{n}}^{ - 1}}\left( {\frac{9}{{5\sqrt {10} }}} \right)\)