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ctgα=1/3
tgα=sinα/cosα
sinα/cosα=3
sinα=3cosα
sin²α+cos²α=1
(3cosα)²+cos²α=1
9cos²α+cos²α=1
10cos²α=1/:10
cos²α=1/10
cosα=√(1/10)
cosα=1 / √10
cosα=√10/10
sinα=3√10 / 10
ctgα=1/3 ; sinα=3√10/10 ; cosα=√10/10