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sin²α+cos²α=1 jedynka trygonometryczna
cos²α=1-sin²α
cos²α=1 - (√3/3)²
cos²α=1-3/9
cos²α=1-1/3
cos²α=2/3
cosα=√2/3
cosα=√2/√3
cosα=(√2*√3)/(√3*√3) uniewymiernianie
cosα=√6/3
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tgα=sinα/cosα
tgα=(√3/3)/(√6/3)
tgα=(√3/3)*(3/√6)
tgα=√3/√6=√3/6=√1/2=1/√2=√2/2
tgα=√2/2
Jezeli sinα=√3/3 to tgα=√2/2 ,a nie 2/3 ,zarem taki kat nie istnieje
Odp. Nie istnieje taki kat α.