Question

Jika Sin a = -3, a sudut pada kuadran IV, maka cos a = ..... ?
5

Answer 1

Cos - x/r r= 5 y=-3 jadi x = 4

x/r = 4/5

Answer 2

Kuadran IV cos bernilai +
maka cos a = √(5² - (-3)²) / 5
= 4/5