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Find the values of the following: tan(13...

Find the values of the following: `tan(13pi)/(12)`

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Given`tan((13pi)/(12))`
=`tan(pi-pi/12)`
=`tan(pi/12)`
=`tan(pi/4-pi/6)`
=`(tan(pi/4)-tan(pi/6))/(1+tan(pi/4)tan(pi/6))`
=`(1-1/sqrt(3))/(1+1/sqrt(3))`
=`(sqrt(3)-1)/(sqrt(3)+1)`
=`[(sqrt(3)-1).(sqrt(3)-1)]/[(sqrt(3)+1)(sqrt(3)-1)]`
...
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