Jeżeli α jest kątem ostrym i tgα=2, to:A. sinα=√5/2
B. sinα= 2√5/5
C. sinα= √5/5
D. sinα=√5
ctg alfa=1/2
x²=1+4
x²=5
x=√5
sin alfa=2/√5=2√5/5
Odp. B
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ctg alfa=1/2
x²=1+4
x²=5
x=√5
sin alfa=2/√5=2√5/5
Odp. B