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sinα = 0,5 to α = 30°
cosα = 1/2 to α = 60°
90° + 30° + 60° = 180° - istnieje
b)
ctgα = √3 to α = 30°
tgα = √3 to α = 60°
90° + 30° + 60° = 180° - istnieje
c)
cosα = 2/3
sinα = √5/3
3² = (√5)² + 2²
9 = 5 + 4
9 = 9
istnieje