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sin²α=1-(2/5)²
sin²α =25/25 -4/25 =21/25
sinα=√(21/25)
sinα=√21/5
tgα=sinα/cosα
tgα=√21/5 :2/5
tgα=√21/2
ctgα=1/tgα
ctgα=2/√21
ctgα=2√21/21