tolong di bantu ya kaka

n = phi
n/3 = 180/3 = 60

f(x) = 2cosx + sinx / tan²x
f(n/3) → f(60) = 2 cos 60 + sin 60 /tan²60
= 2.1/2 + 1/2 √3 / √3²
=1 + 1/2√3 /3
= 1/3 + 1/6√3