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sin²α+(2sinα)²=1
sin²α+4sin²α=1
5sin²α=1
sin²α=1/5
sinα=1/√5 *√5√5
sinα=√5/5
cosα=2√5/5
tgα=sinα/cosα
ctgα=1/tgα
tgα=1/2
ctgα=2