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cosα=15/17 => α=arccos15/17
tgα=tg(arccos15/17)
cosα = 15/17
Obliczam sin α z jedynki trygonometrycznej
sin²α + cos²α = 1
sin²α = 1- cos²α
sin²α = 1 - (15/17)²
sin²α = 1 - 225/289
sin²α = 289/289 - 225/289
sin²α = 64/289
sin α = √(64/289)
sin α = 8/17
Obliczam teraz tg α
tg α = sin α : cosα
tg α = (8/17): (15/17)
tg α = (8/17)*(17/15)
tg α = 8/15