a) Oblicz sin alfa, tg alfa i ctg alfa jeśli cos alfa =3/5
sin α=√1-cos²α = √1-9/25α =√16/25α=4/5
tgα=4/5:3/5=4/5*5/3=4/3
ctgα=3/5:4/5=3/5*5/4=3/4
b)Oblicz cos alfa, tg alfa i ctg alfa, jeśli sin alfa = 1/3
cosα=√1-sin²α=√1-1/9=√8/9=2√2/3
tgα=1/3:2√2/3=1/3*3/2√2=1/2√2
ctgα=2√2/3:1/3=2√2/3*3=2√2
c) Oblicz sin alfa i cos alfa jeśli tg alfa = 12/13 (sinα/cosα)
sinα=12
cosα=13