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ctgα=2
cosα/sinα=2⇒cosα=2*sinα
sin²α+cos²α=1
sin²α+4sin²α=1
5sin²α=1
sinα=1/√5=√5/5
cosα=2√5/5
ctgα=2
cosα/sinα=2⇒cosα=2*sinα
sin²α+cos²α=1
sin²α+4sin²α=15sin²α=1
sinα=1/√5=√5/5tg(90-α)=1/tgα=2ctgα=2cosα/sinα=2⇒cosα=2*sinαsin²α+cos²α=1
sin²α+4sin²α=15sin²α=1sinα=1/√5=√5/5cosα=2√5/5cosα=2√5/5