tunjukan bahwa nilai eksak darri tan 255= akar 3 + 2

tan255 = tan(210+45)
= tan210+tan45 / 1 - tan210tan45
= akar3/3 + 1 / 1 - akar3/3
= (akar3+3)/3 / (3-akar3)/3
= akar3 + 3 / 3 - akar3
(dirasionalkan)
= 3akar3 + 3 + 9 + 3akar3 / 9 - 3
= 6akar3+12 /6
= akar3 + 2