jika tan a = √3 dan a sudut lancip tentukan nilai cos a

tan a = √3
a = 60°
cos 60° = 1/2

tan = y / x
tan a = √3 / 1
y = √3
x = 1
r^2 = x^2 + y^2
r^2 = 1^2 + √3^2
r^2 = 1 + 3
r = 2
cos = x / r
cos a = 1 / 3