Jeżeli alfa jest kątem ostrym i tg alfa = 2 to sin:
a. /5 : 2
b. 2/5 : 5
c. /5 : 5
d. /5
tg alfa = 2
tg = y/x
y = 2
x = 1
r^2 = x^2 + y^2
r^2 = 1 + 4
r^2 = 5
r = /5
sin = y/r
sin = 2 : /5 = 2/5 : 5
Odp. B , sin wynosi 2/5 :5.
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tg alfa = 2
tg = y/x
y = 2
x = 1
r^2 = x^2 + y^2
r^2 = 1 + 4
r^2 = 5
r = /5
sin = y/r
sin = 2 : /5 = 2/5 : 5
Odp. B , sin wynosi 2/5 :5.