Odpowiedź :
Czołem!
cosβ = 3/5
sin²β + cos²β = 1
sin²β + (3/5)² = 1
sin²β + 9/25 = 1
sin²β = 1 - 9/25
sin²β = 16/25
sinβ = 4/5
tgβ = (sinβ)/(cosβ)
tgβ = 4/5 : 3/5 = 4/5 * 5/3 = 4/3
(tgβ)/(sinβ) = 4/3 : 4/5 = 4/3 * 5/4 = 5/3
Czołem!
cosβ = 3/5
sin²β + cos²β = 1
sin²β + (3/5)² = 1
sin²β + 9/25 = 1
sin²β = 1 - 9/25
sin²β = 16/25
sinβ = 4/5
tgβ = (sinβ)/(cosβ)
tgβ = 4/5 : 3/5 = 4/5 * 5/3 = 4/3
(tgβ)/(sinβ) = 4/3 : 4/5 = 4/3 * 5/4 = 5/3