In $\triangle ABC$, if $\tan { \dfrac A2 } $ and $\tan { \dfrac A2 } $ are the roots of the equation $6{ x }^{ 2 }-5x+1=0$, then
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In $\triangle ABC$, if $\tan { \dfrac A2 } $ and $\tan { \dfrac A2 } $ are the roots of the equation $6{ x }^{ 2 }-5x+1=0$, then