a) sinα=5/13; cosα=12/13; tgα5/12; ctgα=12/5
b) sinα=4/5; cosα=3/5; tgα=4/3; ctgα=3/4
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a) sinα=5/13; cosα=12/13; tgα5/12; ctgα=12/5
b) sinα=4/5; cosα=3/5; tgα=4/3; ctgα=3/4
sina = 40/50
cosa = 30/50
tga = 40/30