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sin²α + cos²α = 1
(⅕)²+cos²α = 1
1/25+cos²α=1 / - 1/25
cos²α=24/25
cosα=√24/25
cosα≈4/5
tgα=sinα/cosα
tgα=⅕ / 4/5
tgα=1/5×5/4
tgα=5/20
tgα=1/4
ctgα=cosα/sinα
ctgα=4/5 / 1/5
ctgα=4/5 × 5/1
ctgα=20/5
ctgα=4
2.tg α = 3/11
tgα=sinα/cosα
sinα/cosα=3/11 / × cosα
układ równań
sinα=3/11 ×cosα
cosα= 3/11 / sinα
sinα=3/11 × 3/11 / sinα
sinα=9/11 / sinα /×sinα
sin²α=9/121
sinα=√9/121
sinα=3/11