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sin²α + cos²α = 1
cos²α = 1 - sin²α
cos²α = 1 - 4/9
cos²α = 5/9
cosα = √5/3
x = √5 y = 2 r = 3
tgα = 3√5/5
ctgα = √5/2
b) tgα = √2
ctgα = √2/2
x = 1 y = √2; r = √3
sinα = √2/√3 = √6/3
cosα = 1/√3 = √3/3