Cos 5x=1\2 akar3 0< x< 360 tentukan himpunan hp

cos 5x = 1/2√3 cos 5x = cos 30° 5x = 30° 5X1 = 30°+k.360° X1 = 6°+k.72° k=0 -> x=6° k=1 -> x=78° k=2 -> x=150° k=3 -> x=222° k=4 -> x=294° 5X2 = -30°+k.360° X2 = -6°+k.72° k=1 -> x=66° k=2 -> x=138° k=3 -> x=210° k=4 -> x=282° k=5 -> x=354° HP={6°,66°,78°,138°,150°,210°,222°,282°,294°,354°}