Jika tan x = -2 2/5 dalam selang (3/2π , 2π), maka cos x =
fast respon
Tanx = -2 2/5 = -12/5
y = -12 dan x = 5
r = √((-12)² + 5²) = 13
(3π/2, 2π) ← kuadran IV (x positif)
cosx = x/r = 5/13
Jika tan x = -2 2/5 dalam selang (3/2π , 2π), maka cos x =
fast respon
Tanx = -2 2/5 = -12/5
y = -12 dan x = 5
r = √((-12)² + 5²) = 13
(3π/2, 2π) ← kuadran IV (x positif)
cosx = x/r = 5/13