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|BC|=5
sinα =cosβ = 3/5
cosα=sinβ = 4/5
tgα = ctgβ = 3/4
ctgα = tgα = 4/3
b = 4
z tw. pitagorasa c = 5
sinα = 3/5
sinβ = 4/5
cosα = 4/5
cosβ = 3/5
tgα = 4/3
tgβ = 3/4