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ctgα=1/tgα=1/2
sin²α=sin²α/1=sin²α/(sin²α+sin²α)=tg²α/(1+tg²α)=4/5
cos²α=1-sin²α=1/5
sinα=2/√5=0,4·√5
cosα=1/√5=0,2·√5
Pozdr
Hans
sina/cosa = 2
2cosa = sina
sin^2a + cos^2a = 1
4cos^2 + cos^a = 1
5cos^2 = 1
cos^2 = 1/5
cosa = sqrt(5)/5
sina = 2sqrt(5)/5
ctga = 1/2