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sin²α+cos²α=1
sin²α=1-(2√3/5)=1-12/25=13/15
sinα=√13/5 lub sinα=-√13/5
tgα=sinα/cosα
tgα=√13/5*5/2√3 -*oznacza mnożenie =1/2
lub tgα=-1/2
ctgα=2 lub ctgα=-2
tgα=4
ctgα=¼
tgα=sinα/cosα
{4=sinα/cosα /*cosα
{sin²α+cos²α=1
{sinα=4cosα
{(4cosα)²+cos²α=1
16cos²α+cos²α=1
17cos²α=1 /:17
cos²α=1/17
cosα=1/17 całość pod pierwiastkiem
cosα=√17/17 lub cosα=-√17/17
sinα=4*√17/17=4√17/17 lub sinα=-4√17/17