oblicz sin alfa =3/4 i cotanges alfa1/2

sinα = 49° cosα= 60°

sinα =3/4 i ctgα = 1/2 cosα = ? tgα = ? tgα = 1/ctgα tgα = 2 ctgα = cosα / sinα cosα = ctgα * sinα cosα = ½ * ¾ cosα = 3/8