sec (4x-20°)=2 tentukan nilai x

sec (4x - 20°) = 2
sec (4x - 20°) = sec 60°
4x - 20° = 60°
4x = 60 + 20
4x = 80
x = 80/4 = 20°
bisa juga
sec (4x - 20) = sec 300
4x - 20 = 300
4x = 300 + 20
x = 320/4 = 80°

Bab Trigonometri
Matematika SMA Kelas X

sec (4x - 20°) = 2

4x - 20° = 60°
4x = 20 + 60
x = 80°/4
x = 20°

4x - 20° = 300°
4x = 300° + 20°
x = 320°/4
x = 80°

HP = { 20°, 80°, 0° < x < 90° }