Ifa+ b+ c= 180° then cos(b+ c ) / cosbcosc
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cosa=cosb cosc
sina/cosa=(sina/cosb cosc)
tana=sin(b+c)/cosb cosc
tana=sinb cosc+cosb sinc/cosb cosc
tana=tanb +tanc
then tan(b+c)=tanb+tanc/1-tanb tanc
-tana = tana/1-tanb tanc
tanb tanc= 2
cotb cotc =1/2 from a+b+c= 180
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