nomor 5,6,7 yang kelanjutan tadi

5.
sin 90 + cos (90+60) - sin (180+30)
= sin 90 - sin 60 + sin 30
= 1 - 1/2 akar 3 + 1/2
= (3-akar3)/2

6.
x = 6 cos 30
x = 3 akar 3

y = 6 sin 30
y = 3

P(3akar3,3)

7.
r² = (-2)² + (-2akar3)²
r² = 16
r = 4

tan x= 2akar3/2
tan x = akar 3
x = 60°

alfa = 180+60 = 240°
P(4,240°)